knowledge/awesome-cheatsheets
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Merge pull request #112 from ltctl/master

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Update bash.sh
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Julien Le Coupanec 2020-04-01 23:08:45 +02:00 committed by GitHub
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1 changed files with 18 additions and 6 deletions
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languages/bash.sh
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@ -67,7 +67,7 @@ clear # clears content on window (hide displayed lines)
ls # lists your files in current directory, ls <dir> to print files in a specific directory ls # lists your files in current directory, ls <dir> to print files in a specific directory
ls -l # lists your files in 'long format', which contains the exact size of the file, who owns the file and who has the right to look at it, and when it was last modified ls -l # lists your files in 'long format', which contains the exact size of the file, who owns the file and who has the right to look at it, and when it was last modified
ls -a # lists all files, including hidden files (name beginning with '.') ls -a # lists all files in 'long format', including hidden files (name beginning with '.')
ln -s <filename> <link> # creates symbolic link to file ln -s <filename> <link> # creates symbolic link to file
touch <filename> # creates or updates (edit) your file touch <filename> # creates or updates (edit) your file
cat <filename> # prints file raw content (will not be interpreted) cat <filename> # prints file raw content (will not be interpreted)
@ -79,8 +79,11 @@ vim <filename> # opens a file in VIM (VI iMproved) text editor, w
mv <filename1> <dest> # moves a file to destination, behavior will change based on 'dest' type (dir: file is placed into dir; file: file will replace dest (tip: useful for renaming)) mv <filename1> <dest> # moves a file to destination, behavior will change based on 'dest' type (dir: file is placed into dir; file: file will replace dest (tip: useful for renaming))
cp <filename1> <dest> # copies a file cp <filename1> <dest> # copies a file
rm <filename> # removes a file rm <filename> # removes a file
find . -name <name> <type> # searches for a file or a directory in the current directory and all its sub-directories by its name
diff <filename1> <filename2> # compares files, and shows where they differ diff <filename1> <filename2> # compares files, and shows where they differ
wc <filename> # tells you how many lines, words and characters there are in a file. Use -lwc (lines, word, character) to ouput only 1 of those informations wc <filename> # tells you how many lines, words and characters there are in a file. Use -lwc (lines, word, character) to ouput only 1 of those informations
sort <filename> # sorts the contents of a text file line by line in alphabetical order, use -n for numeric sort and -r for reversing order.
sort -t -k <filename> # sorts the contents on specific sort key field starting from 1, using the field separator t.
chmod -options <filename> # lets you change the read, write, and execute permissions on your files (more infos: SUID, GUID) chmod -options <filename> # lets you change the read, write, and execute permissions on your files (more infos: SUID, GUID)
gzip <filename> # compresses files using gzip algorithm gzip <filename> # compresses files using gzip algorithm
gunzip <filename> # uncompresses files compressed by gzip gunzip <filename> # uncompresses files compressed by gzip
@ -100,8 +103,13 @@ grep -r <pattern> <dir> # search recursively for pattern in directory
mkdir <dirname> # makes a new directory mkdir <dirname> # makes a new directory
rmdir <dirname> # remove an empty directory
rmdir -rf <dirname> # remove a non-empty directory
mv <dir1> <dir2> # rename a directory from <dir1> to <dir2>
cd # changes to home cd # changes to home
cd .. # changes to the parent directory
cd <dirname> # changes directory cd <dirname> # changes directory
cp -r <dir1> <dir2> # copy <dir1> into <dir2> including sub-directories
pwd # tells you where you currently are pwd # tells you where you currently are
@ -153,6 +161,8 @@ echo $varname # checks a variable's value
echo $$ # prints process ID of the current shell echo $$ # prints process ID of the current shell
echo $! # prints process ID of the most recently invoked background job echo $! # prints process ID of the most recently invoked background job
echo $? # displays the exit status of the last command echo $? # displays the exit status of the last command
read <varname> # reads a string from the input and assigns it to a variable
let <varname> = <equation> # performs mathematical calculation using operators like +, -, *, /, %
export VARNAME=value # defines an environment variable (will be available in subprocesses) export VARNAME=value # defines an environment variable (will be available in subprocesses)
array[0]=valA # how to define an array array[0]=valA # how to define an array
@ -230,12 +240,14 @@ str1 == str2 # str1 matches str2
str1 != str2 # str1 does not match str2 str1 != str2 # str1 does not match str2
str1 < str2 # str1 is less than str2 (alphabetically) str1 < str2 # str1 is less than str2 (alphabetically)
str1 > str2 # str1 is greater than str2 (alphabetically) str1 > str2 # str1 is greater than str2 (alphabetically)
str1 \> str2 # str1 is sorted after str2
str1 \< str2 # str1 is sorted before str2
-n str1 # str1 is not null (has length greater than 0) -n str1 # str1 is not null (has length greater than 0)
-z str1 # str1 is null (has length 0) -z str1 # str1 is null (has length 0)
# FILES # FILES
-a file # file exists -a file # file exists or its compilation is successful
-d file # file exists and is a directory -d file # file exists and is a directory
-e file # file exists; same -a -e file # file exists; same -a
-f file # file exists and is a regular file (i.e., not a directory or other special type of file) -f file # file exists and is a regular file (i.e., not a directory or other special type of file)