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- #! /bin/bash
- # echo "Hello World"
- # echo $BASH
- # name=Farid
- # echo "My name is $name"
- # echo "Let's me know your name : "
- # read name1 name2 name3
- # echo "Hi, $name1, $name2, $name3"
- # read -p "username: " user_var
- # # using ss4 flag to hide input
- # read -sp "password: " user_pass
- # echo
- # echo "your username is $user_var"
- # echo "your password is $user_pass"
- # echo "Enter names : "
- # read -a names
- # echo "Names : ${names[0]} ${names[1]}"
- # echo "Enter names : "
- # read
- # echo "Names : $REPLY"
- #try running this file like this ./hello.sh Farid1 2 Test
- # echo "parameter1: $1, parameter2: $2, parameter3: $3"
- # args=("$@")
- # echo "${args[0]}, ${args[1]}, ${args[2]}"
- # echo $@
- # If structure on Bash Script
- # if [ condition ]
- # then
- # statement
- # fi
- # count=10
- # if [ $count -gt 9 ]
- # then
- # echo "condition is true"
- # fi
- #
- # if (( $count > 9 ))
- # then
- # echo "condition is true"
- # fi
- #
- # word="abc"
- # word=a
- # if [ $word == "abc" ]
- # then
- # echo "condition is true"
- # fi
- #
- # if [[ $word < "b" ]]
- # then
- # echo "b is greater than a true"
- # elif [[ $word == "a" ]]
- # then
- # echo "a is true"
- # else
- # echo "condition is false"
- # fi
- # get file exists
- # echo -e "Enter the name of the file : \c"
- # read file_name
- # if [ -e $file_name ]
- # then
- # echo "$file_name found"
- # else
- # echo "$file_name not found"
- # fi
- #
- # check if file exists and regular files
- # echo -e "Enter the name of the file : \c"
- # read file_name
- #
- # if [ -f $file_name ]
- # then
- # echo "$file_name found"
- # else
- # echo "$file_name not found"
- # fi
- #
- # check if folder exists and its a directory
- # echo -e "Enter the name of the folder : \c"
- # read folder_name
- #
- # if [ -d $folder_name ]
- # then
- # echo "$folder_name found"
- # else
- # echo "$folder_name not found"
- # fi
- #
- # check if file empty or not
- # echo -e "Enter the name of the file : \c"
- # read file_name
- # if [ -s $file_name ]
- # then
- # echo "$file_name not empty"
- # else
- # echo "$file_name empty"
- # fi
- # echo -e "Enter the name of the file : \c"
- # read file_name
- # if [ -f $file_name ]
- # then
- # if [ -w $file_name ]
- # then
- # echo "Type some text data. to quit press ctrl+d."
- # cat >> $file_name
- # else
- # echo "The file do not have permissions"
- # fi
- # else
- # echo "$file_name not exists"
- # fi
- # age=25
- # if [ "$age" -gt 18 ] && [ "$age" -lt 30 ]
- # then
- # echo "valid age"
- # else
- # echo "age not valid"
- # fi
- #
- # age=25
- # if [ "$age" -gt 18 -a "$age" -lt 30 ]
- # then
- # echo "valid age"
- # else
- # echo "age not valid"
- # fi
- #
- # age=25
- # if [[ "$age" -gt 18 && "$age" -lt 30 ]]
- # then
- # echo "valid age"
- # else
- # echo "age not valid"
- # fi
- #
- # age=25
- # if [[ "$age" -eq 18 || "$age" -eq 30 ]]
- # then
- # echo "valid age"
- # else
- # echo "age not valid"
- # fi
- #
- # age=25
- # if [ "$age" -eq 18 -o "$age" -eq 30 ]
- # then
- # echo "valid age"
- # else
- # echo "age not valid"
- # fi
- # num1=20
- # num2=5
- #
- # echo $(( $num1 + $num2 ))
- # echo $(( $num1 - $num2 ))
- # echo $(( $num1 * $num2 ))
- # echo $(( $num1 / $num2 ))
- # echo $(( $num1 % $num2 ))
- #
- # num1=20
- # num2=5
- # echo $(expr $num1 + $num2 )
- # echo $(expr $num1 - $num2 )
- # echo $(expr $num1 * $num2 )
- # echo $(expr $num1 / $num2 )
- # echo $(expr $num1 % $num2 )
- #
- # num1=20
- # num2=5
- # echo "$num1+$num2" | bc
- # echo "$num1-$num2" | bc
- # echo "$num1*$num2" | bc
- # echo "scale=20;$num1/$num2" | bc
- # echo "$num1%$num2" | bc
- #
- # num3=4
- # echo "scale=2;sqrt($num3)" | bc -l
- # echo "scale=2;$num3^2" | bc -l
- # vehicle=$1
- #
- # case $vehicle in
- # "car" )
- # echo "Rent of $vehicle is 100 dollars" ;;
- # "van" )
- # echo "Rent of $vehicle is 80 dollars" ;;
- # "bicycle" )
- # echo "Rent of $vehicle is 5 dollars" ;;
- # "truck" )
- # echo "Rent of $vehicle is 150 dollars" ;;
- # * )
- # echo "Unknown vehicle" ;;
- # esac
- # echo -e "Enter some character : \c"
- # read value
- #
- # case $value in
- # [a-z] )
- # echo "User entered $value a to z" ;;
- # [A-Z] )
- # echo "User entered $value A to Z" ;;
- # [0-9] )
- # echo "User entered $value 0 to 9" ;;
- # ? )
- # echo "User entered $value special character" ;;
- # * )
- # echo "Unknown vehicle" ;;
- # esac
- # os=("ubuntu" "windows" "kali")
- # os[6]=mac
- # unset os[2]
- # echo "${os[@]}"
- # echo "${os[1]}"
- # get index
- # echo "${!os[@]}"
- # get length
- # echo "${#os[@]}"
- # while loops
- # while [ condition ]
- # do
- # command1
- # command2
- # command3
- # done
- #
- # n=1
- #
- # while [ $n -le 10 ]
- # do
- # echo "$n"
- # n=$(( n + 1 ))
- # done
- #
- # while (( $n <= 10 ))
- # do
- # echo "$n"
- # n=$(( n + 1 ))
- # done
- #
- # while (( $n <= 10 ))
- # do
- # echo "$n"
- # (( n++ ))
- # sleep 1
- # done
- # content of the file will be pass to $p
- # while read p
- # do
- # echo "$p"
- # done < test.txt
- #
- # cat hello.sh | while read p
- # do
- # echo "$p"
- # done
- #
- # -r flg is going to prevent backslashes escapes from being interpreted
- # while IFS= read -r line
- # do
- # echo "$line"
- # done < test.txt
- # until loops structure
- # until [ condition ]
- # do
- # command1
- # command2
- # command3
- # ...
- # ...
- # commandN
- # done
- #
- #n=1
- #
- # until [ $n -ge 10 ]
- # do
- # echo "$n"
- # (( n++ ))
- # done
- #
- # until (( $n >= 10 ))
- # do
- # echo "$n"
- # (( n++ ))
- # done
- # for loops
- # for VARIABLE in 1 2 3 4 .. N
- # do
- # command1
- # command2
- # ...
- # commandN
- # done
- #
- # OR
- #
- # for VARIABLE in file1 file2 file3
- # do
- # command1 on $VARIABLE
- # command2
- # ...
- # commandN
- # done
- #
- # OR
- #
- # for OUTPUT in $(Linux-Or-Unix-Command-Here)
- # do
- # command1 on $OUTPUT
- # command2 on $OUTPUT
- # ...
- # commandN
- # done
- #
- # OR C expression
- #
- # for (( exp1; exp2; exp3 ))
- # do
- # command1
- # command2
- # ...
- # commandN
- # done
- #
- # read -p "Input multiple : "
- # n=()
- # for VARIABLE in $REPLY
- # do
- # n+=('-d')
- # n+=($VARIABLE)
- # done
- # echo ${n[@]}
- #
- # for i in {1..10}
- # do
- # echo $i
- # done
- #
- # for i in {1..10}
- # do
- # echo $i
- # done
- #
- # for (( i=0; i<5; i++ ))
- # do
- # echo $i
- # done
- # for command in ls pwd date
- # do
- # echo "--------$command--------"
- # $command
- # done
- #
- # for item in *
- # do
- # if [ -d $item ]
- # then
- # echo $item
- # fi
- # done
- # select loops
- # select varName in list
- # do
- # command1
- # command2
- # ...
- # commandN
- # done
- #
- # select name in Andi Budi Santi
- # do
- # case $name in
- # Andi)
- # echo "Andi selected"
- # ;;
- # Budi)
- # echo "Budi selected"
- # ;;
- # Santi )
- # echo "Santi selected"
- # ;;
- # *)
- # echo "Error please provide the no. between 1..3"
- # ;;
- # esac
- # done
- # Break & Continue statement
- # for (( i=1; i<10; i++ ))
- # do
- # if [ $i -gt 5 ]
- # then
- # break
- # fi
- # echo "$i"
- # done
- #
- # for (( i=1; i<10; i++ ))
- # do
- # if [ $i -eq 5 -o $i -eq 6 ]
- # then
- # continue
- # fi
- # echo "$i"
- # done
- # function
- # function name(){
- # commands
- # }
- #
- # name () {
- # commands
- # }
- #
- # function Hello(){
- # echo "Hello"
- # }
- #
- # quit () {
- # exit
- # }
- #
- # quit
- # Hello
- #
- # function print(){
- # echo $1 $2
- # }
- #
- # print Hello World
- # function print(){
- # local name=${@}
- # echo $name
- # }
- #
- # print Hello World
- # echo $name
- # example use of function
- # usage() {
- # echo "You need to provide an argument : "
- # echo "usage : $0 file_name"
- # quit
- # }
- #
- # is_file_exist() {
- # local file=$1
- # [[ -f "$file" ]] && return 0 || return 1
- # }
- #
- # quit() {
- # exit
- # }
- #
- # [[ $# -eq 0 ]] && usage
- # if ( is_file_exist "$1" )
- # then
- # echo "File found"
- # else
- # echo "File not found"
- # fi
- # Read-only command
- # var=71
- # readonly var
- # var=50
- # echo "var => $var"
- # hello() {
- # echo "Hello world"
- # }
- # readonly -f hello
- # hello() {
- # echo "Hello world again"
- # }
- # hello
- # Signals and Traps
- # trap "echo Exit command detected" 0
- # echo "Hello"
- # exit 0
- #
- # check signal from > man signal
- # trap "echo Exit command detected; exit" 0 2 15
- # echo "pid is $$"
- # while (( COUNT < 10 ))
- # do
- # sleep 10
- # (( COUNT ++ ))
- # echo $COUNT
- # done
- # exit 0
- # Debug Script
- # use bash -x ./hello.sh
- # or you can specify -x options in the top (ex. /bin/bash -x)
- # or you can use like this
- # trap "echo Exit command detected; exit" 0 2 15
- # set -x
- # echo "pid is $$"
- # set +x
- # while (( COUNT < 10 ))
- # do
- # sleep 10
- # (( COUNT ++ ))
- # echo $COUNT
- # done
- # exit 0
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