Shell script 5

 #!/usr/bin/bash

#command line arguments if the no of arguments are not matching the script will exit

path=$1

pattern=$2

echo "total number of arguments $#"

if [ ! "$#" = 2 ]

then

        echo "Please provide the required arguments, No of arguments are not matching"

        echo "Usage of this script is sh <<filename.sh>> arg1 arg2"

        echo "Rerun the script with the required arguments\n Thank you for using this script"

        exit 1

else

        echo "Controller starts executing the script"

        required_pattern=$(grep $pattern $path)

        echo "$required_pattern"

fi

Output:

kalam@DESKTOP-OSJTLNE:~$ sh  command_lin_arguments.sh

total number of arguments 0

Please provide the required argunments, No of arguments are not matching

Usage of this script is sh <<filename>> arg1 arg2

Rerun the script with the required arguments

Thank you for using this script

! --> Is Used to for negation of condition

$# --> It returns the total number of arguments 

$1 -> Indicates 1st argument

$2 --> Indicates 2nd argument