unix - Giving a parameter and help section to shell script

Question

I have a problem that I want to determine folder name manually. For example, if user runs this script as below,

./scriptname -k 

They can take the results, but folder names are determined in script. How can I determine folder name manually as below?

Answer 1

You could write the help as a function:

usage(){
cat <<EOT
Usage: ${0##*/} dir1 dir2
EOT
}

if [ $# -ne 2 ]; then
    usage
    echo 'please enter two folder names'
    exit 1
fi

if [ ! -d "$1" ]; then
    usage
    echo "$1 is not a folder"
    exit 1
fi

if [ ! -d "$2" ]; then
    usage
    echo "$2 is not a folder"
    exit 1
fi

# continue script