Merge branch 'master' of github.com:LeCoupa/awesome-cheatsheets

README.md

@@ -54,6 +54,7 @@ Feel free to take a look. You might learn new things. They have been designed to
 #### Javascript
 
 - [Adonis.js](backend/adonis.js)
+- [Express.js](backend/express.js)
 - [Feathers.js](backend/feathers.js)
 - [Moleculer](backend/moleculer.js)
 - [Node.js](backend/node.js)

backend/express.js

@@ -0,0 +1,226 @@
+/* *******************************************************************************************
+ * API
+ * http://expressjs.com/en/api.html
+ * ******************************************************************************************* */
+`npm i express --save` or`yarn add -D express``(-D saves it as a dev dependency)`
+`yarn add -D @types/express``(Installing for TS)`
+
+const express = require("express"); // Importing the express library.
+const app = express(); // Intializing the imported express application
+
+/* *******************************************************************************************
+ * GLOBAL OBJECTS
+ * http://expressjs.com/en/api.html#express.json
+ * ******************************************************************************************* */
+
+```Methods```;
+
+`express.json([options]);`
+
+options: `
+inflate                   // to manage the deflated bodies like enabling and disabling
+
+limit                     // Controls the maximum request body size.
+
+reviver                   // It is passed directly to JSON.parse as an second argument
+
+type                      // This is used to determine the type of middleware will parse
+
+verify                    // It is an undefined function which used to verify the middleware parsing.
+
+`;
+
+`express.raw([options]);`
+
+options: `
+inflate                   // to manage the deflated bodies like enabling and disabling
+
+limit                     // Controls the maximum request body size.
+
+type                      // This is used to determine the type of middleware will parse
+
+verify                    // It is an undefined function which used to verify the middleware parsing.
+`;
+
+`express.Router([options]);`
+
+options: `
+caseSensitive             //Enables case sensitivity
+
+mergeParams               //if param names of child and parent are conflicted then the child takes the precedence
+
+strict                    // Enables Strict routing
+`;
+
+`express.static(root, [options]);`
+
+options: `
+dotfiles                 // determines how dotfiles are used
+
+etag                     // Operates etag generation
+
+extensions               // Operates file extension fallback
+
+fallthrough              //	Enable or disable the immutable directive in the Cache-Control response header
+
+index                    // sends the specified directory index file
+
+LastModified             // sets the Last-Modified header to the last modified date
+
+setHeaders               // Function for setting HTTP headers to serve with the file
+`;
+
+`express.text([options]);`
+
+options: `
+defaultCharset          // Sets the default charset for the text context.
+
+inflate                 // to manage the deflated bodies like enabling and disabling
+
+limit                   // Controls the maximum request body size.
+
+type                    // This is used to determine the type of middleware will parse
+
+verify                  // It is an undefined function which used to verify the middleware parsing.
+`;
+
+`express.urlencoded([options]);`
+
+options: `
+extended                // it allows to choose between parsing the URL-encoded data or the qs library
+
+parameterLimit          // It controls the no of params.
+
+inflate                 // to manage the deflated bodies like enabling and disabling
+
+limit                   // Controls the maximum request body size.
+
+type                    // This is used to determine the type of middleware will parse
+
+verify                  // It is an undefined function which used to verify the middleware parsing.
+`;
+
+```Application`````;
+Properties```app.local`;
+
+`app.locals.title = "My Cheatsheet";
+
+console.dir(app.locals.title)`;                     `// Creating objects with local variables`
+
+app.mountpath`
+
+``app.mountpath``const admin = express()
+admin.get('/', function(req,res){
+    console.log(admin.mountpath)
+    res.send('Admin Homepage')
+})                            
+
+app.use('<admin dir>', admin)`;                    `// Mounting a sub - app`
+
+``Event``
+
+`admin.on('mount', (parent){
+    console.log('Admin Mounted')
+})`                                                `// Mounting on a parent app`
+
+``Methods``
+`app.get('/', function(req, res){
+    res.send('GET request to message')
+})`                                               `// get requests to the specified path`
+
+`app.post('/', function(req,res){
+    res.send('POST request to a webpage')
+})`                                               `// post request to the specified path`
+
+`app.put('/', function(req,res){
+    res.send('PUT request to a webpage')
+})`                                               `// post request to the specified path`
+
+`app.delete('/', function(req,res){
+    res.send('DELETE request to a webpage')
+})`                                               `// delete request to the specified path`
+
+`app.all('/', function(req,res,next){
+    console.log('Accessing the secret section....')
+    next()
+})`                                               `// Routing all types of HTTP request`
+
+`app.param('user', function(req,res,next){
+    User.find(id, function(err, user){
+        if(err){
+            next(err)
+        } else if (user){
+            req.user = user
+            next()
+        } else {
+            next(new Error('Failed to load user'))
+        }
+    })
+})`                                               `// Adding callback trigger to route parameters`
+
+`app.use(function(req,res,next){
+    res.send('Hey There!')
+})`                                               `// To Invoke the middleware layer that you want to add`
+
+```Request```
+``Methods``
+
+`req.get('content-type')`                         `// Returns the specified HTTP req header`
+
+`req.accepts('html')`                             `// Checks if the specified content types are available or not`
+
+`req.is('json')`                                  `// Requests the matching content-type`
+    
+`var range = req.range(1000)
+if (range.type === 'bytes'){
+    range.forEach(function(r){
+        // Your code
+    })
+}`                                                `// Range header parser`
+    
+``Properties``
+
+`req.param('name')`                               `// Requests the param name when present`
+    
+`app.post('/', function (req, res, next) {
+    console.log(req.body)
+    res.json(req.body)
+})`                                                `// Data submitted in the request body`
+
+`console.dir(req.cookies.name)`                    `// Contains cookies sent by the request`
+
+`console.dir(req.query.q)`                         `// Query string parameter in the route`
+
+`console.log(req.route)
+res.send('GET')`                                   `// Outputs all the layer, methods, path`
+
+`console.dir(req.signedCookies.user)`              `// Logs all the signed cookies sent by the request`
+
+
+```Response```
+``Methods``
+        
+`res.redirect('https://google.com')`               `// Redirects to the intended page`
+
+`res.send({message: 'Awesome Stuffs'})`            `// Response to the webpage` 
+        
+`res.json({alert: 'awesomecheatsheets'})`          `// Response in JSON type`
+
+`const file = req.params.name;
+res.sendFile(file, options, function(err){
+    if(err){
+        next(err)
+    }else{
+        console.log('Sent:', file)
+    }
+})`                                                `// Sends file to the intended path`
+
+`res.render('index')`                              `// Rendering the intended file`
+
+```BodyParser```
+    
+`const BodyParser = require('body-parser')
+app.use(BodyParser.json())
+app.use(BodyParser.urlencoded({
+    extended: true
+}))`                                               `// Parses incoming request bodies`

backend/node.js

@@ -436,7 +436,7 @@ request.on('connect', function(response, socket, head) { });   // Emitted each t
 request.on('upgrade', function(response, socket, head) { });   // Emitted each time a server responds to a request with an upgrade. If this event isn't being listened for, clients receiving an upgrade header will have their connections closed.
 request.on('continue', function() { });                        // Emitted when the server sends a '100 Continue' HTTP response, usually because the request contained 'Expect: 100-continue'. This is an instruction that the client should send the request body.
 
-response.write(chunk, [encoding]);                             // This sends a chunk of the response body. If this merthod is called and response.writeHead() has not been called, it will switch to implicit header mode and flush the implicit headers.
+response.write(chunk, [encoding]);                             // This sends a chunk of the response body. If this method is called and response.writeHead() has not been called, it will switch to implicit header mode and flush the implicit headers.
 response.writeContinue();                                      // Sends a HTTP/1.1 100 Continue message to the client, indicating that the request body should be sent.
 response.writeHead(statusCode, [reasonPhrase], [headers]);     // Sends a response header to the request.
 response.setTimeout(msecs, callback);                          // Sets the Socket's timeout value to msecs. If a callback is provided, then it is added as a listener on the 'timeout' event on the response object.

languages/bash.sh

@@ -46,6 +46,7 @@ CTRL+X then (   # start recording a keyboard macro
 CTRL+X then )   # finish recording keyboard macro
 CTRL+X then E   # recall last recorded keyboard macro
 CTRL+X then CTRL+E   # invoke text editor (specified by $EDITOR) on current command line then execute resultes as shell commands
+CTRL+A then D  # logout from screen but don't kill it, if any command exist, it will continue 
 
 BACKSPACE  # deletes one character backward
 DELETE     # deletes one character under cursor
@@ -54,6 +55,7 @@ history   # shows command line history
 !!        # repeats the last command
 !<n>      # refers to command line 'n'
 !<string> # refers to command starting with 'string'
+esc :wq   # exits and saves script
 
 exit      # logs out of current session
 
@@ -87,8 +89,11 @@ readlink <filename>           # shows where a symbolic links points to
 tree                          # show directories and subdirectories in easilly readable file tree
 mc                            # terminal file explorer (alternative to ncdu)
 touch <filename>              # creates or updates (edit) your file
-mktemp -t <filename>            # make a temp file in /tmp/ which is deleted at next boot (-d to make directory)
+mktemp -t <filename>          # make a temp file in /tmp/ which is deleted at next boot (-d to make directory)
-cat <filename>                # prints file raw content (will not be interpreted)
+cat <filename>                # displays file raw content (will not be interpreted)
+cat -n <filename>             # shows number of lines
+cat filename1 > filename2     # Copy filename1 to filename2
+cat filename1 >> filename2    # merge two files texts together 
 any_command > <filename>      # '>' is used to perform redirections, it will set any_command's stdout to file instead of "real stdout" (generally /dev/stdout)
 more <filename>               # shows the first part of a file (move with space and type q to quit)
 head <filename>               # outputs the first lines of file (default: 10 lines)
@@ -164,6 +169,7 @@ info <command>           # shows another documentation system for the specific c
 help                     # shows documentation about built-in commands and functions
 df                       # shows disk usage
 du <filename>            # shows the disk usage of the files and directories in filename (du -s give only a total)
+resize2fs                # ext2/ext3/ext4 file system resizer
 last <yourUsername>      # lists your last logins
 ps -u yourusername       # lists your processes
 kill <PID>               # kills the processes with the ID you gave
@@ -179,8 +185,9 @@ whois <domain>           # gets whois information for domain
 dig <domain>             # gets DNS information for domain
 dig -x <host>            # reverses lookup host
 wget <file>              # downloads file
+netstat                  # Print network connections, routing tables, interface statistics, masquerade connections, and multicast memberships
 
-time <command>             # report time consumed by command execution
+time <command>           # report time consumed by command execution
 
 
 ##############################################################################

languages/golang.md

@@ -641,7 +641,7 @@ func TestSum(t *testing.T) {
     x, y := 2, 4
     expected := 2 + 4
 
-    if !reflect.DeepEqual(sum(x, y), expected) {
+    if !reflect.DeepEqual(Sum(x, y), expected) {
         t.Fatalf("Function Sum not working as expected")
     }
 }

languages/java.md

@@ -85,7 +85,7 @@ int c = a + b;
     double tan(double theta) //tangent of theta
     double toRadians(double degrees) // convert angle from degrees to radians
     double toDegrees(double radians)  // convert angle from radians to degrees
-    double exp(doube a)  // exponential (e^a)
+    double exp(double a)  // exponential (e^a)
     double pow(double a, double p) //raise a to the bth power (a^b)
     double random() //random in [0,1)
     double sqrt(double a)  //square root of a
@@ -578,8 +578,8 @@ class MyClass extends MySuperClass implements YourInterface {
 ```java
   public class Queue<Item> implements Iterable<Item>
 
-  Queue()  //create an emptyh queue
+  Queue()  //create an empty queue
-  boolean isEmpthy()  //return if the queue empthy
+  boolean isEmpty()  //return if the queue empty
   void enqueue(Item item) // insert an item onto queue
   Item dequeue()  //return and remove the item that was inserted least recently
   int size() //number of item on queue
@@ -591,7 +591,7 @@ class MyClass extends MySuperClass implements YourInterface {
 //import Iterator
 import java.util.Iterator;
 
-public class Queue<Item> implements Iterable <Item> { 
+public class Queue<Item> implements Iterable<Item> { 
 
 //FIFO queue
   private Node first;
@@ -627,9 +627,9 @@ public class Queue<Item> implements Iterable <Item> {
 * **SET DATA TYPE**
 
 ```java
-  public class SET<Key extends Comparable<Key>> implements Iterable<Key>
+  public class Set<Key extends Comparable<Key>> implements Iterable<Key>
-  SET() //create an empthy set
+  Set() //create an empty set
-  boolean isEmpthy()  //return if the set is empthy
+  boolean isEmpty()  //return if the set is empty
   void add (Key key)  //add key to the set
   void remove(Key key)  //remove key from set
   boolean contains(Key key) //return if the key is in the set

languages/python.md

@@ -70,15 +70,15 @@
 | yield | yields values instead of returning (are called generators) | returning keyword |
 | import | import libraries/modules/packages | import |
 | from | import specific function/classes from modules/packages | import |
-| try | this block will be tried to get executed | execption handling |
+| try | this block will be tried to get executed | exception handling |
-| execpt | is any execption/error has occured it'll be executed | execption handling |
+| except | is any exception/error has occured it'll be executed | exception handling |
-| finally | It'll be executed no matter execption occurs or not | execption handling | 
+| finally | It'll be executed no matter exception occurs or not | exception handling | 
-| raise | throws any specific error/execption | execption handling |
+| raise | throws any specific error/exception | exception handling |
-| assert | throws an AssertionError if condition is false | execption handling |
+| assert | throws an AssertionError if condition is false | exception handling |
 | async | used to define asynchronous functions/co-routines | asynchronous programming |
 | await | used to specify a point when control is taken back | asynchronous programming |
 | del | deletes/unsets any user defined data |  variable handling |
-| global | used to access variables defined outsied of function | variable handling |
+| global | used to access variables defined outside of function | variable handling |
 | nonlocal | modify variables from different scopes | variable handling |
 <br>
 
@@ -134,7 +134,7 @@
 
 - Lists are created using square brackets:
 
-```py
+```python
 thislist = ["apple", "banana", "cherry"] 
 ```
 
@@ -147,18 +147,31 @@ thislist = ["apple", "banana", "cherry"]
 - To determine how many items a list has, use the `len()` function.
 
 - A list can contain different data types:
-```py
+```python
 list1 = ["abc", 34, True, 40, "male"]
 ```
 - It is also possible to use the list() constructor when creating a new list
-```py
+```python
 thislist = list(("apple", "banana", "cherry"))  # note the double round-brackets
 ```
+- pop() function removes the last value in the given list by default.
+
+  ```python
+  thislist = ["apple", "banana", "cherry"] 
+  
+  print(thislist.pop())  # cherry
+  print(thislist.pop(0))  #apple 
+  
+  ```
+
+  
+
 ### Tuple
+
 - Tuple is a collection which is ordered and unchangeable. Allows duplicate members.
 - A tuple is a collection which is ordered and unchangeable.
 - Tuples are written with round brackets.
-```py
+```python
 thistuple = ("apple", "banana", "cherry")
 ```
 - Tuple items are ordered, unchangeable, and allow duplicate values.
@@ -168,25 +181,25 @@ thistuple = ("apple", "banana", "cherry")
 - Tuples are unchangeable, meaning that we cannot change, add or remove items after the tuple has been created.
 - Since tuple are indexed, tuples can have items with the same value:
 - Tuples allow duplicate values:
-```py
+```python
 thistuple = ("apple", "banana", "cherry", "apple", "cherry")
 ```
 - To determine how many items a tuple has, use the  `len()`function:
-```py
+```python
 thistuple = ("apple", "banana", "cherry")
 print(len(thistuple))
 ```
 - To create a tuple with only one item, you have to add a comma after the item, otherwise Python will not recognize it as a tuple.
-```py
+```python
 thistuple = ("apple",)
 print(type(thistuple))
 
-#NOT a tuple
+# NOT a tuple
 thistuple = ("apple")
 print(type(thistuple))
 ```
 - It is also possible to use the tuple() constructor to make a tuple.
-```py
+```python
 
 thistuple = tuple(("apple", "banana", "cherry")) # note the double round-brackets
 print(thistuple)
@@ -195,7 +208,7 @@ print(thistuple)
 ### Set
 - Set is a collection which is unordered and unindexed. No duplicate members.
 - A set is a collection which is both unordered and unindexed.
-```py
+```python
 thisset = {"apple", "banana", "cherry"}
 ```
 - Set items are unordered, unchangeable, and do not allow duplicate values.
@@ -206,27 +219,38 @@ thisset = {"apple", "banana", "cherry"}
 - Sets are unchangeable, meaning that we cannot change the items after the set has been created.
 - Duplicate values will be ignored.
 - To determine how many items a set has, use the `len()` method.
-```py
+```python
 thisset = {"apple", "banana", "cherry"}
 
 print(len(thisset))
 ```
 - Set items can be of any data type:
-```py
+```python
 set1 = {"apple", "banana", "cherry"}
 set2 = {1, 5, 7, 9, 3}
 set3 = {True, False, False}
 set4 = {"abc", 34, True, 40, "male"}
 ```
 - It is also possible to use the `set()` constructor to make a set.
-```py
+```python
 thisset = set(("apple", "banana", "cherry")) # note the double round-brackets
 ```
+- frozenset()  is just an immutable version of Set. While elements of a set can be modified at any time, elements of the frozen set remain the same after creation.
+
+```python
+set1 = {"apple", "banana", "cherry"}
+frzset=frozenset(set1)
+print(frzset)
+```
+
+
+
 ### Dictionary
+
 - Dictionary is a collection which is unordered and changeable. No duplicate members.
 - Dictionaries are used to store data values in key:value pairs.
 - Dictionaries are written with curly brackets, and have keys and values:
-```py
+```python
 thisdict = {
   "brand": "Ford",
   "model": "Mustang",
@@ -234,7 +258,7 @@ thisdict = {
 }
 ```
 - Dictionary items are presented in key:value pairs, and can be referred to by using the key name.
-```py
+```python
 thisdict = {
   "brand": "Ford",
   "model": "Mustang",
@@ -246,11 +270,11 @@ print(thisdict["brand"])
 - Dictionaries cannot have two items with the same key.
 - Duplicate values will overwrite existing values.
 - To determine how many items a dictionary has, use the `len()` function.
-```py
+```python
 print(len(thisdict))
 ```
 - The values in dictionary items can be of any data type
-```py
+```python
 thisdict = {
   "brand": "Ford",
   "electric": False,
@@ -259,9 +283,26 @@ thisdict = {
 }
 ```
 
+- pop() Function is used to remove a specific value from a dictionary. You can only use key bot the value. Unlike Lists you have to give a value to this function
+
+  ```python
+   car = {
+    "brand": "Ford",
+    "model": "Mustang",
+    "year": 1964
+  }
+  
+  x = car.pop("model")
+  
+  print(x)# Mustang
+  print(car)#{'brand': 'Ford', 'year': 1964}
+  ```
+
+  
+
 ### Conditional branching
 
-```py
+```python
     if condition:
         pass
     elif condition2:
@@ -278,7 +319,7 @@ thisdict = {
 #### While loop
 - With the `while` loop we can execute a set of statements as long as a condition is true.
 - Example: Print i as long as i is less than 6
-```py
+```python
 i = 1
 while i < 6:
   print(i)
@@ -296,7 +337,7 @@ while i < 6:
 - This is less like the for keyword in other programming languages, and works more like an iterator method as found in other object-orientated programming languages.
 
 - With the for loop we can execute a set of statements, once for each item in a list, tuple, set etc.
-```py
+```python
 fruits = ["apple", "banana", "cherry"]
 for x in fruits:
   print(x)
@@ -310,7 +351,7 @@ A nested loop is a loop inside a loop.
 
 - The "inner loop" will be executed one time for each iteration of the "outer loop":
 
-```py
+```python
 adj = ["red", "big", "tasty"]
 fruits = ["apple", "banana", "cherry"]
 
@@ -320,19 +361,19 @@ for x in adj:
 ```
 - for loops cannot be empty, but if you for some reason have a for loop with no content, put in the pass statement to avoid getting an error.
 
-```py
+```python
 for x in [0, 1, 2]:
   pass
 ```
 
 ### Function definition
-```py
+```python
 def function_name():
     return
 ```
 ### Function call
 
-```py 
+```python
 function_name()
 ```
 

tools/git.sh

@@ -4,15 +4,32 @@ git clone <address> # creates a git repo from given address (get the address fro
 git clone <address> -b <branch_name> <path/to/directory>  # clones a git repo from the address into the given directory and checkout's the given branch
 git clone <address> -b <branch_name> --single-branch  # Clones a single branch
 
-git add file.txt   # adds(stages) file.txt to the git
+git add <file_name>   # adds(stages) file.txt to the git
 git add *          # adds(stages) all new modifications, deletions, creations to the git
 git reset file.txt # Removes file.txt from the stage
 git reset --hard   # Throws away all your uncommitted changes, hard reset files to HEAD
+git reset --soft <commit_id> # moves the head pointer
+git reset --mixed <commit_id> # moves the head pointer and then copies the files from the commit it is now pointing to the staging area,
+# the default when no argument is provided
+git reset -hard <commit_id> # moves the head pointer and then copies the files from the commit it is now pointing to the staging area 
+# and working directory thus, throw away all uncommitted changes
+
+# git reset
+# 1. Move HEAD and current branch
+# 2. Reset the staging area
+# 3. Reset the working area
+
+# --soft = (1)
+# --mixed = (1) & (2) (default)
+# --hard = (1) & (2) & (3)
+
 git rm file.txt    # removes file.txt both from git and file system
 git rm --cached file.txt # only removes file.txt both from git index
 git status         # shows the modifications and stuff that are not staged yet
 
 git branch                         # shows all the branches (current branch is shown with a star)
+git branch -a                     # shows all the branches local and remote
+
 git branch my-branch               # creates my-branch
 git branch -d my-branch            # deletes my-branch
 git checkout my-branch         	   # switches to my-branch
@@ -32,7 +49,13 @@ git remote add my-remote <address> # creates a remote (get the address from your
 git remote rm my-remote            # Remove a remote
 
 git log                      # shows the log of commits
+# git log by default uses less command so you can use these: f=next page, b=prev page, search=/<query>, n=next match, p=prev match, q=quit
+git log --no-pager    # shows the log of commits without less command
 git log --oneline            # shows the log of commits, each commit in a single line
+
+git log --oneline --graph --decorate    # shows the log of commits, each commit in a single line with graph 
+git log --since=<time>                    # shows the log of commits since given time
+git log -- <file_name>
 git log -p <file_name>       # change over time for a specific file
 git log <Branch1> ^<Branch2> # lists commit(s) in branch1 that are not in branch2
 git log -n <x>               # lists the last x commits
@@ -40,6 +63,9 @@ git log -n <x> --oneline     # lists the last x commits, each commit in single l
 git grep --heading --line-number '<string/regex>' # Find lines matching the pattern in tracked files
 git log --grep='<string/regex>'                   # Search Commit log
 
+git reflog                       # record when the tips of branches and other references were updated in the local repository.
+git ls-files                     # show information about files in the index and the working tree
+
 git commit -m "msg"          # commit changes with a msg
 git commit -m "title" -m "description" # commit changes with a title and description
 git commit --amend           # combine staged changes with the previous commit, or edit the previous commit message without changing its snapshot
@@ -48,8 +74,11 @@ git commit --amend --author='Author Name <email@address.com>'    # Amend the aut
 git push my-remote my-branch # pushes the commits to the my-remote in my-branch (does not push the tags)
 git revert <commit-id>       # Undo a commit by creating a new commit
 
-git show                     # shows one or more objects (blobs, trees, tags and commits).
+git show                    # shows one or more objects (blobs, trees, tags and commits).
 git diff                     # show changes between commits, commit and working tree
+git diff HEAD               #show changes between working directory vs last commit
+git diff --staged HEAD    #show changes between stage area vs last commit
+
 git diff --color             # show colored diff
 git diff --staged            # Shows changes staged for commit
 
@@ -61,7 +90,8 @@ git push --delete my-remote v1.0  # deletes the tag in my-remote (be carefore to
 git push my-remote my-branch v1.0 # push v1.0 tag to my-remote in my-branch
 git fetch --tags                  # pulls the tags from remote
 
-git pull my-remote my-branch         # pulls and tries to merge my-branch from my-remote to the current branch
+git pull my-remote my-branch   # pulls and tries to merge my-branch from my-remote to the current branch git pull = git fetch && get merge
+
 
 git stash                            # stashes the staged and unstaged changes (git status will be clean after it)
 git stash -u                         # stash everything including new untracked files (but not .gitignore)
@@ -81,20 +111,65 @@ git rebase --continue             # Continue rebasing after fixing all conflicts
 
 git clean -f                      # clean untracked files permanently
 git clean -f -d/git clean -fd     # To remove directories permanently
-git clean -f -X/git clean -fX     # To remove ignored files permanently
+git clean -f -X/git clean -fX    # To remove ignored files permanently
 git clean -f -x/git clean -fx     # To remove ignored and non-ignored files permanently
+git clean -d --dry-run            # shows what would be deleted
+
 
 git config --global --list                   # lists the git configuration for all repos
 git config --global --edit                   # opens an editor to edit the git config file
-git config --global alias.<handle> <command> # add git aliases to speed up workflow , eg. if  handle is st and command is status then running git st would execute git status 
+git config --global alias.<handle> <command> # add git aliases to speed up workflow , eg.
+# if  handle is st and command is status then running git st would execute git status 
+git config --global core.editor <editor_name>      # config default editor
+
+
+git archive <branch_name> --format=zip --outpute=./<archive_name>.zip # create an archive of files from a named tree
 
 
 .gitignore
 # is a file including names of stuff that you don"t want to be staged or tracked.
-# You usually keep your local files like database, media, and etc here.
+# You usually keep your local files like database, media, etc here.
 # You can find good resources online about ignoring specific files in your project files.
 # .gitignore is also get ignored 
 .git
 # is a hidden directory in repo directory including git files. It is created after "git init".
 
 
+# Some useful notes:
+
+# Better Commit messages:
+#   Key to Effective Debugging
+#   For the commit message to help in debugging effectively, ensure that it is short and use an imperative 
+#   mood (spoken or written as if giving a command or instruction) when constructing them.
+#   Also use feature tense for commit messages.
+#   The first word in your commit message should be one of these:
+#   Add
+#   Create
+#   Refactor
+#   Fix
+#   Release
+#   Document
+#   Modify
+#   Update
+#   Remove
+#   Delete etc...
+
+# About resetting:
+#   Use git revert instead of git reset in shared repositories
+#   git revert creates a new commit that introduces the opposite changes from the specified commit.
+#   Revert does not change history the original commit stays in the repository
+
+
+# Difference between ~ and ^ in git:
+#   > ^ or ^n
+#       >no args: == ^1: the first parent commit
+#       >n: the nth parent commit
+
+#   > ~ or ~n
+#       >no args: == ~1: the first commit back, following 1st parent
+#       >n: number of commits back, following only 1st parent
+#   note: ^ and ~ can be combined
+
+# Some tools to improve git skill by visualizing it:
+#   https://git-school.github.io/visualizing-git/
+#   https://learngitbranching.js.org/

tools/nginx.sh

@@ -165,7 +165,7 @@ server {
 # The majority of SSL options depend on what your application does or needs
 
 server {
-    listen 443 ssl;
+    listen 443 ssl http2;
     server_name example.com;
 
     ssl on;
@@ -212,4 +212,4 @@ server {
   location / {
     proxy_pass http://node_js;
   }
-}
+}

tools/vim.txt

@@ -215,6 +215,7 @@ z=                  suggest word
 :q                  quit Vim. This fails when changes have been made.
 :q!                 quit without writing.
 :cq                 quit always, without writing.
+:w                  save without exiting.
 :wq                 write the current file and exit.
 :wq!                write the current file and exit always.
 :wq {file}          write to {file}. Exit if not editing the last

tools/vscode.md

@@ -54,12 +54,18 @@
 
 - [`Gitignore`](https://marketplace.visualstudio.com/items?itemName=codezombiech.gitignore): An extension for Visual Studio Code that assists you in working with .gitignore files.
 
+- [`GitLens`](https://marketplace.visualstudio.com/items?itemName=eamodio.gitlens): Visualize code authorship, code lens, seamlessly Git blame annotations and more.
+
+- [`Gitmoji`](https://marketplace.visualstudio.com/items?itemName=Vtrois.gitmoji-vscode): An emoji tool for your git commit messages.
+
 ### Themes
 
 - [`Material Icon Theme`](https://marketplace.visualstudio.com/items?itemName=PKief.material-icon-theme): Material Design Icons for Visual Studio Code.
 
 - [`Palenight Theme`](https://marketplace.visualstudio.com/items?itemName=whizkydee.material-palenight-theme): An elegant and juicy material-like theme for Visual Studio Code.
 
+- [`Office Theme`](https://marketplace.visualstudio.com/items?itemName=huacat.office-theme) A Microsoft Office theme for Visual Studio Code.
+
 ### Handy
 
 - [`Better comments`](https://marketplace.visualstudio.com/items?itemName=aaron-bond.better-comments): Improve your code commenting by annotating with alert, informational, TODOs, and more!
@@ -96,6 +102,8 @@
 
 - [`Wrap Console Log`](https://marketplace.visualstudio.com/items?itemName=midnightsyntax.vscode-wrap-console-log): Wrap to console.log by word or selection.
 
+- [`Bracket Pair Colorizer`](https://marketplace.visualstudio.com/items?itemName=CoenraadS.bracket-pair-colorizer): Allows matching brackets to be identified with colours. 
+
 ## My Settings
 
 ```javascript