Week 12/13: Assignment - Loops and Functions

2020-12-05 11:12:16 +02:00 · 2020-12-05 11:12:16 +02:00 · c9cfa9f8e4
parent 49dc6e805f
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--- a/week-13/add.sh
+++ b/week-13/add.sh
@ -0,0 +1,67 @@
+#!/bin/bash
+# * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
+#  Champlain College SDEV-415-81
+#
+#  Linux/Unix Programming Week 13: Loops and Function  - (2020/12/06)
+#
+# * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
+#
+#  Write a script named add that takes two command line arguments and displays as output their sum.
+#  The script is required to contain a function named add that takes
+#  these two arguments and returns their sum.
+#
+#  Your script should also verify that the user entered two and only
+#  two arguments at the command line.
+#
+#  If the user does not execute the program correctly,
+#  an error should be display describing the correct usage.
+#
+# * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
+#
+#  Written by Llewellyn van der Merwe <llewellyn.vandermerw@mymail.champlain.edu>, December 2020
+#  Copyright (C) 2020. All Rights Reserved
+#  License GNU/GPL Version 2 or later - http://www.gnu.org/licenses/gpl-2.0.html
+#
+# * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
+
+# addition function
+function add() {
+  # do the sum ;)
+  num=$(echo $1 + $2 | bc)
+  # we return the sum
+  echo "The sum is $num"
+}
+
+# help function
+function show_help {
+  echo "================================================================"
+  echo $1
+  cat << EOF
+================================================================
+Usage: ${0##*/:-} [OPTION...]
+
+Provide two numbers as arguments
+
+Example run:
+  ${0##*/:-} 5 8
+The sum is 13
+===============================================================
+EOF
+  exit 1
+}
+
+# check enough arguments were passed
+if [ $# -eq 2 ]; then
+  # check input is numbers
+  regex='^[0-9]+([\.][0-9]+)?$'
+  if [[ $1 =~ $regex && $2 =~ $regex ]]; then
+    # run main function
+    add "$1" "$2"
+  else
+    show_help "Error: Not a number"
+  fi
+elif [ $# -gt 2 ]; then
+  show_help "Error: Too many arguments"
+else
+  show_help "Error: Not enough arguments"
+fi
--- a/week-13/foodmenu.sh
+++ b/week-13/foodmenu.sh
@ -0,0 +1,137 @@
+#!/bin/bash
+# * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
+#  Champlain College SDEV-415-81
+#
+#  Linux/Unix Programming Week 13: Loops and Function  - (2020/12/06)
+#
+# * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
+#
+#  The Program will display a menu that a user can select an option from and get a little note ;)
+#
+# * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
+#
+#  Write a script that will do the following:
+#      Provide a comment section at the top of the script,
+#      with your name, the date, and the purpose of the program.
+#
+#      Use the select loop to produce a menu of foods.
+#      Produce output to resemble the following:
+#        1) Steak and potatoes
+#        2) Fish and chips
+#        3) Soup and salad
+#        --------------------------
+#        Please make a selection. 1
+#          Stick to your ribs
+#          Watch your cholesterol.
+#          Enjoy your meal.
+#        --------------------------
+#        Please make a selection. 2
+#          British are coming!
+#          Enjoy your meal.
+#        --------------------------
+#        Please make a selection. 3
+#          Health foods…
+#          Dieting is so boring.
+#          Enjoy your meal.
+#
+# * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
+#
+#  Written by Llewellyn van der Merwe <llewellyn.vandermerw@mymail.champlain.edu>, December 2020
+#  Copyright (C) 2020. All Rights Reserved
+#  License GNU/GPL Version 2 or later - http://www.gnu.org/licenses/gpl-2.0.html
+#
+# * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
+
+# basic main function ;)
+function main() {
+  # some house cleaning
+  PS3_old=$PS3
+  # some defaults
+  export PS3="Please make a selection: "
+  # Start our little Menu
+  select menu in \
+      'Steak and potatoes' \
+      'Fish and chips' \
+      'Soup and salad' \
+      'Done'
+  do
+    case $REPLY in
+        1 ) ribsNotice;;
+        2 ) britishNotice;;
+        3 ) healthNotice;;
+        4 )
+            # final greeting
+            echo
+            echo "Goodbye! ${USER^}"
+            echo
+            exit 0;;
+        * )
+            echo "Error select option 1..4";;
+    esac
+    # we can add a normal break here if the loop must just run once
+    # break;
+  done
+  # restore the default
+  export PS3=$PS3_old
+}
+
+# Welcome...
+function welcomeNotice() {
+  # get the current date
+  current_date=$(date +"%A %-d %b %Y");
+  # set at the top of the menu (script)
+  echo "My name is Llewellyn"
+  echo "Today is $current_date"
+  echo "Welcome to the Café Prestige"
+  echo
+  echo "Here is our menu for the day."
+}
+
+# Just to show the menu again (not ideal)
+function reminderNotice(){
+  echo
+  echo "Would you like another?"
+  echo "1) Steak and potatoes"
+  echo "2) Fish and chips"
+  echo "3) Soup and salad"
+  echo "4) Done"
+}
+
+# Show the welcome notice
+welcomeNotice
+
+# The menu notice for
+# Steak and potatoes
+function ribsNotice() {
+  echo
+  echo ">>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>"
+  echo "Stick to your ribs"
+  echo "Watch your cholesterol."
+  echo "Enjoy your meal."
+  echo "<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<"
+  reminderNotice
+}
+# The menu notice for
+# Fish and chips
+function britishNotice() {
+  echo
+  echo ">>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>"
+  echo "British are coming!"
+  echo "Enjoy your meal."
+  echo "<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<"
+  reminderNotice
+}
+# The menu notice for
+# Soup and salad
+function healthNotice() {
+  echo
+  echo ">>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>"
+  echo "Health foods…"
+  echo "Dieting is so boring."
+  echo "Enjoy your meal."
+  echo "<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<"
+  reminderNotice
+}
+
+# run main.. lol
+main
--- a/week-13/loops_functions.log
+++ b/week-13/loops_functions.log
@ -0,0 +1,91 @@
+Script started on 2020-12-07 06:17:57+02:00 [TERM="xterm-256color" TTY="/dev/pts/0" COLUMNS="130" LINES="27"]
+]2; ~/Champlain/C/2_Week13_1[32;1m[0m2_Week13_1[0m » exit./add.sh 3 64.2r[K[K[5@foodmenu[C[C[C[Cmchecker[C[C[C[C[8Pls -la./mchecker.sh 
+Llewellyn, You have new mail
+Llewellyn, You have new mail
+^C
+]2; ~/Champlain/C/2_Week13_1[32;1m[0m2_Week13_1[0m » ./mchecker.sh exit[K./add.sh 3 64.2r[K[K[5@foodmenu[C[C[C[C
+My name is Llewellyn
+Today is Monday 7 Dec 2020
+Welcome to the Café Prestige
+
+Here is our menu for the day.
+1) Steak and potatoes
+2) Fish and chips
+3) Soup and salad
+4) Done
+Please make a selection: 6
+Error select option 1..4
+Please make a selection: 1
+
+>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
+Stick to your ribs
+Watch your cholesterol.
+Enjoy your meal.
+<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
+
+Would you like another?
+1) Steak and potatoes
+2) Fish and chips
+3) Soup and salad
+4) Done
+Please make a selection: 2
+
+>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
+British are coming!
+Enjoy your meal.
+<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
+
+Would you like another?
+1) Steak and potatoes
+2) Fish and chips
+3) Soup and salad
+4) Done
+Please make a selection: 3
+
+>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
+Health foods…
+Dieting is so boring.
+Enjoy your meal.
+<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
+
+Would you like another?
+1) Steak and potatoes
+2) Fish and chips
+3) Soup and salad
+4) Done
+Please make a selection: 4
+
+Goodbye! Llewellyn
+
+]2; ~/Champlain/C/2_Week13_1[32;1m[0m2_Week13_1[0m » ./foodmenu.sh mchecker[C[C[C[Cexit[K./add.sh 3 64.2r[K[K[5@foodmenu[C[C[C[C[5Padd[C[C[C[C
+================================================================
+Error: Not enough arguments
+================================================================
+Usage: ./add.sh [OPTION...]
+
+Provide two numbers as arguments
+
+Example run:
+  ./add.sh 5 8
+The sum is 13
+===============================================================
+]2; ~/Champlain/C/2_Week13_1[32;1m[0m2_Week13_1[0m » ./add.sh [5@foodmenu[C[C[C[Cmchecker[C[C[C[Cexit[K./add.sh 3 64.2r[K
+================================================================
+Error: Not a number
+================================================================
+Usage: ./add.sh [OPTION...]
+
+Provide two numbers as arguments
+
+Example run:
+  ./add.sh 5 8
+The sum is 13
+===============================================================
+]2; ~/Champlain/C/2_Week13_1[32;1m[0m2_Week13_1[0m » ./add.sh 3 r[K[5@foodmenu[C[C[C[Cmchecker[C[C[C[Cexit[K./add.sh 3 64.2
+The sum is 67.2
+]2; ~/Champlain/C/2_Week13_1[32;1m[0m2_Week13_1[0m » ./add.sh 3 64.2[K342 64.34. 64.343 64.34
+The sum is 96.64
+]2; ~/Champlain/C/2_Week13_1[32;1m[0m2_Week13_1[0m » exit
+exit
+
+Script done on 2020-12-07 06:19:57+02:00 [COMMAND_EXIT_CODE="0"]
--- a/week-13/mchecker.sh
+++ b/week-13/mchecker.sh
@ -0,0 +1,58 @@
+#!/bin/bash
+# * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
+#  Champlain College SDEV-415-81
+#
+#  Linux/Unix Programming Week 13: Loops and Function  - (2020/12/06)
+#
+# * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
+#
+#  Write a program called mchecker to check for new mail and
+#  write a message to the screen if new mail has arrived.
+#    The program will get the size of the mail spool file for the user.
+#    (The spool files are found in /var/spool/mail/$USER on Linux,
+#    Use the find command if you cannot locate the file.)
+#    The script will execute in a continuous loop, once every 30 seconds.
+#    Each time the loop executes, it will compare the size of the mail spool
+#    file with its size from the previous loop. If the new size is greater than
+#    the old size, a message will be printed on your screen,
+#    saying “Username, You have new mail”.
+#         The size of a file can be found by looking
+#         at the output from ls –l, wc –c or from the find command.
+#
+#  Note: To test this, you can simply edit the spool file to add a new entry.
+#    (echo "More data" >> /var/spool/mail/$USER)
+# * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
+#
+#  Written by Llewellyn van der Merwe <llewellyn.vandermerw@mymail.champlain.edu>, December 2020
+#  Copyright (C) 2020. All Rights Reserved
+#  License GNU/GPL Version 2 or later - http://www.gnu.org/licenses/gpl-2.0.html
+#
+# * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
+
+# path to the spool mail file
+FILENAME=/var/spool/mail/$USER
+# check if this file exist
+if [ ! -f $FILENAME ]; then
+  # give console error
+  echo "The mail spool file for $USER does not exist in [$FILENAME]."
+  # break out here
+  exit 1
+fi
+# the size tracker
+LASTFILESIZE=0
+# start the continuous loop
+while true; do
+  FILESIZE=$(stat -c%s "$FILENAME")
+  if [[ $FILESIZE -gt $LASTFILESIZE ]]; then
+    # only give message if LASTFILESIZE is greater than 0
+    if [[ $LASTFILESIZE -gt 0 ]]; then
+      # give notice to console
+      echo "${USER^}, You have new mail"
+    fi
+    # set the new size
+    LASTFILESIZE=$FILESIZE
+  fi
+  # run this check again every
+  # 30 seconds
+  sleep 30s
+done