M NUR ALFIANSYAH

#! /bin/bash os=('ubuntu' 'windows' 'kali') os[6]='mac' unset os[2] echo "${os[@]}" echo "${os[0]}" echo "${!os[@]}" echo "${#os[@]}" string=dasfdsafsadfasdf echo "${string[@]}" echo "${string[0]}" echo "${string[1]}" echo "${#string[@]}"

#! /bin/bash 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 $value special character" ;; * ) echo "Unknown input" ;; esac Output: test@test$ ./hello.sh Enter some character : f User entered f a to z test@test$ ./hello.sh Enter some character : K User entered K a to z test@test$ LANG = C test@test$ ./hello.sh Enter some character : K User entered K A to Z test@test$ ./hello.sh Enter some character : 9 User entered 9 0 to 9 test@test$ ./hello.sh Enter some character : 5 User entered 5 0 to 9 test@test$ ./hello.sh Enter some character : & User entered & special character test@test$ ./hello.sh Enter some character : sdsdsdsd Unknown input test@test$

#! /bin/bash vehicle=$1 case $vehicle in "car" ) echo "Rent of $vehicle is 100 dollar" ;; "van" ) echo "Rent of $vehicle is 80 dollar" ;; "bicycle" ) echo "Rent of $vehicle is 5 dollar" ;; "truck" ) echo "Rent of $vehicle is 150 dollar" ;; * ) echo "Unknown vehicle" ;; esac

#! /bin/bash num1=20.5 num2=5 echo "$num1+$num2" | bc echo "$num1-$num2" | bc echo "20.5*5" | bc echo "scale=20;20.5/5" | bc echo "20.5%5" | bc num=4 echo "scale=2;sqrt($num)" | bc -l echo "scale=2;3^3" | bc -l

#! /bin/bash num1=20 num2=5 echo $(( num1 + num2 )) echo $(( num1 - num2 )) echo $(( num1 * num2 )) echo $(( num1 / num2 )) echo $(( num1 % num2 )) echo $(expr $num1 + $num2 ) echo $(expr $num1 - $num2 ) echo $(expr $num1 \* $num2 ) echo $(expr $num1 / $num2 ) echo $(expr $num1 % $num2 )

#! /bin/bash age=60 # for using OR operator use || if [ "$age" -gt 18] || ["$age" -lt 30 ] then echo "valid age" else echo "age not valid" fi # The -o option provide # an alternative compound condition test. if [ "$age" -gt 18 -o "$age" -lt 30 ] then echo "valid age" else echo "age not valid" fi # if [[ $condition1 || $condition2 ]] # Also works. if [[ "$age" -gt 18 || "$age" -lt 30 ]] then echo "valid age" else echo "age not valid" fi

#! /bin/bash age=60 # for using And operator use && if [ "$age" -gt 18] && ["$age" -lt 30 ] then echo "valid age" else echo "age not valid" fi # The -a option provide # an alternative compound condition test. if [ "$age" -gt 18 -a "$age" -lt 30 ] then echo "valid age" else echo "age not valid" fi # if [[ $condition1 && $condition2 ]] # Also works. if [[ "$age" -gt 18 && "$age" -lt 30 ]] then echo "valid age" else echo "age not valid" fi

#! /bin/bash 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 >> $file_name else echo "The file do not have write permissions" fi else echo "$file_name not exists" fi

#! /bin/bash 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

Bash Shell Conditional Statements   Conditionals  let us decide whether to perform an action or not, this decision is taken by evaluating an expression. The most basic form is:        if [ expression ];        then              statements        elif [ expression ];        then              statements        else              statements        fi the  elif  (else if) and  else  sections  are optional Put  spaces after [  and  before ],  and  around the operators  and  operands.   Bash Shell Expressions   An  expression  can be:  String comp...

#! /bin/bash # $* Returns a single string (``$1, $2 ... $n'') # comprising all of the positional parameters # separated by the internal field separator character #(defined by the IFS environment variable). # $0 Refers to the name of the script itself echo $0 $1 $2 $3 ' > echo $1 $2 $3' # $@ Returns a sequence of strings # (``$1'', ``$2'', ... ``$n'') # wherein each positional parameter # remains separate from the others. args=("$@") echo ${args[0]} ${args[1]} ${args[2]} echo $@ # $# Refers to the number of arguments # specified on a command line. echo $# output: test@test$ ./hello.sh Mark Tom John ./hello.sh Mark Tom John > echo $1 $2 $3 Mark Tom John Mark Tom John 3

#! /bin/bash echo "Enter name : " read name echo "Enterd name : $name" # Multiple inputs echo "Enter names : " read name1 name2 name3 echo "Names : $name1 , $name2, $name3" # Two commonly used options however are # -p which allows you to specify a prompt # -s which makes the input silent. read -p 'username : ' user_var read -sp 'password : ' pass_var echo echo "username : $user_var" echo "password : $pass_var" # -a makes read command to read into an array echo "Enter name : " read -a names echo "Names : ${names[0]}, ${names[1]}" # read command will now store the reply into the default build-in variable $REPLY echo "Enter name : " read echo "Name : $REPLY"