bradtraversy · November 25, 2025 20:36 · alphaoumardev · Oct 13, 2023 · BODY1998 · Jun 23, 2024
diff --git a/myscript.sh b/myscript.sh
 #! /bin/bash

 # ECHO COMMAND
 # echo Hello World!

 # VARIABLES
 # Uppercase by convention
 # Letters, numbers, underscores
 NAME="Bob"
 # echo "My name is $NAME"
 # echo "My name is ${NAME}"

 # USER INPUT
 # read -p "Enter your name: " NAME
 # echo "Hello $NAME, nice to meet you!"

 # SIMPLE IF STATEMENT
 # if [ "$NAME" == "Brad" ]
 # then
 #   echo "Your name is Brad"
 # fi

 # IF-ELSE
 # if [ "$NAME" == "Brad" ]
 # then
 #   echo "Your name is Brad"
 # else 
 #   echo "Your name is NOT Brad"
 # fi

 # ELSE-IF (elif)
 # if [ "$NAME" == "Brad" ]
 # then
 #   echo "Your name is Brad"
 # elif [ "$NAME" == "Jack" ]
 # then  
 #   echo "Your name is Jack"
 # else 
 #   echo "Your name is NOT Brad or Jack"
 # fi

 # COMPARISON
 # NUM1=31
 # NUM2=5
 # if [ "$NUM1" -gt "$NUM2" ]
 # then
 #   echo "$NUM1 is greater than $NUM2"
 # else
 #   echo "$NUM1 is less than $NUM2"
 # fi

 ########
 # val1 -eq val2 Returns true if the values are equal
 # val1 -ne val2 Returns true if the values are not equal
 # val1 -gt val2 Returns true if val1 is greater than val2
 # val1 -ge val2 Returns true if val1 is greater than or equal to val2
 # val1 -lt val2 Returns true if val1 is less than val2
 # val1 -le val2 Returns true if val1 is less than or equal to val2
 ########

 # FILE CONDITIONS
 # FILE="test.txt"
 # if [ -e "$FILE" ]
 # then
 #   echo "$FILE exists"
 # else
 #   echo "$FILE does NOT exist"
 # fi

 ########
 # -d file   True if the file is a directory
 # -e file   True if the file exists (note that this is not particularly portable, thus -f is generally used)
 # -f file   True if the provided string is a file
 # -g file   True if the group id is set on a file
 # -r file   True if the file is readable
 # -s file   True if the file has a non-zero size
 # -u    True if the user id is set on a file
 # -w    True if the file is writable
 # -x    True if the file is an executable
 ########

 #CASE STATEMENT
 # read -p "Are you 21 or over? Y/N " ANSWER
 # case "$ANSWER" in 
 #   [yY] | [yY][eE][sS])
 #     echo "You can have a beer :)"
 #     ;;
 #   [nN] | [nN][oO])
 #     echo "Sorry, no drinking"
 #     ;;
 #   *)
 #     echo "Please enter y/yes or n/no"
 #     ;;
 # esac

 # SIMPLE FOR LOOP
 # NAMES="Brad Kevin Alice Mark"
 # for NAME in $NAMES
 #   do
 #     echo "Hello $NAME"
 # done

 # FOR LOOP TO RENAME FILES
 # FILES=$(ls *.txt)
 # NEW="new"
 # for FILE in $FILES  
 #   do
 #     echo "Renaming $FILE to new-$FILE"
 #     mv $FILE $NEW-$FILE
 # done

 # WHILE LOOP - READ THROUGH A FILE LINE BY LINE
 # LINE=1
 # while read -r CURRENT_LINE
 #   do
 #     echo "$LINE: $CURRENT_LINE"
 #     ((LINE++))
 # done < "./new-1.txt"

 # FUNCTION
 # function sayHello() {
 #   echo "Hello World"
 # }
 # sayHello

 # FUNCTION WITH PARAMS
 # function greet() {
 #   echo "Hello, I am $1 and I am $2"
 # }

 # greet "Brad" "36"

 # CREATE FOLDER AND WRITE TO A FILE
 # mkdir hello
 # touch "hello/world.txt"
 # echo "Hello World" >> "hello/world.txt"
 # echo "Created hello/world.txt"
	#! /bin/bash

	# ECHO COMMAND
	# echo Hello World!

	# VARIABLES
	# Uppercase by convention
	# Letters, numbers, underscores
	NAME="Bob"
	# echo "My name is $NAME"
	# echo "My name is ${NAME}"

	# USER INPUT
	# read -p "Enter your name: " NAME
	# echo "Hello $NAME, nice to meet you!"

	# SIMPLE IF STATEMENT
	# if [ "$NAME" == "Brad" ]
	# then
	# echo "Your name is Brad"
	# fi

	# IF-ELSE
	# if [ "$NAME" == "Brad" ]
	# then
	# echo "Your name is Brad"
	# else
	# echo "Your name is NOT Brad"
	# fi

	# ELSE-IF (elif)
	# if [ "$NAME" == "Brad" ]
	# then
	# echo "Your name is Brad"
	# elif [ "$NAME" == "Jack" ]
	# then
	# echo "Your name is Jack"
	# else
	# echo "Your name is NOT Brad or Jack"
	# fi

	# COMPARISON
	# NUM1=31
	# NUM2=5
	# if [ "$NUM1" -gt "$NUM2" ]
	# then
	# echo "$NUM1 is greater than $NUM2"
	# else
	# echo "$NUM1 is less than $NUM2"
	# fi

	########
	# val1 -eq val2 Returns true if the values are equal
	# val1 -ne val2 Returns true if the values are not equal
	# val1 -gt val2 Returns true if val1 is greater than val2
	# val1 -ge val2 Returns true if val1 is greater than or equal to val2
	# val1 -lt val2 Returns true if val1 is less than val2
	# val1 -le val2 Returns true if val1 is less than or equal to val2
	########

	# FILE CONDITIONS
	# FILE="test.txt"
	# if [ -e "$FILE" ]
	# then
	# echo "$FILE exists"
	# else
	# echo "$FILE does NOT exist"
	# fi

	########
	# -d file True if the file is a directory
	# -e file True if the file exists (note that this is not particularly portable, thus -f is generally used)
	# -f file True if the provided string is a file
	# -g file True if the group id is set on a file
	# -r file True if the file is readable
	# -s file True if the file has a non-zero size
	# -u True if the user id is set on a file
	# -w True if the file is writable
	# -x True if the file is an executable
	########

	#CASE STATEMENT
	# read -p "Are you 21 or over? Y/N " ANSWER
	# case "$ANSWER" in
	# [yY] \| [yY][eE][sS])
	# echo "You can have a beer :)"
	# ;;
	# [nN] \| [nN][oO])
	# echo "Sorry, no drinking"
	# ;;
	# *)
	# echo "Please enter y/yes or n/no"
	# ;;
	# esac

	# SIMPLE FOR LOOP
	# NAMES="Brad Kevin Alice Mark"
	# for NAME in $NAMES
	# do
	# echo "Hello $NAME"
	# done

	# FOR LOOP TO RENAME FILES
	# FILES=$(ls *.txt)
	# NEW="new"
	# for FILE in $FILES
	# do
	# echo "Renaming $FILE to new-$FILE"
	# mv $FILE $NEW-$FILE
	# done

	# WHILE LOOP - READ THROUGH A FILE LINE BY LINE
	# LINE=1
	# while read -r CURRENT_LINE
	# do
	# echo "$LINE: $CURRENT_LINE"
	# ((LINE++))
	# done < "./new-1.txt"

	# FUNCTION
	# function sayHello() {
	# echo "Hello World"
	# }
	# sayHello

	# FUNCTION WITH PARAMS
	# function greet() {
	# echo "Hello, I am $1 and I am $2"
	# }

	# greet "Brad" "36"

	# CREATE FOLDER AND WRITE TO A FILE
	# mkdir hello
	# touch "hello/world.txt"
	# echo "Hello World" >> "hello/world.txt"
	# echo "Created hello/world.txt"
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