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- #! /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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