Shell Programming and Scripting

#!/bin/bash

SRC="${1}"   # Start Directory  

function main {

        validate 
        run

}

function validate {
        # Is parameter missing?
        if [ -z "${SRC}" ]
        then
                printf "You need to supply a source.\n"
                exit 1
        fi
        # Is parameter a directory?
        if [ ! -d "${SRC}" ]
        then
                printf "This is not a directory! You need to specify a directory.\n"
                exit 1
        fi
}

function run {

        find "${SRC}" -type f | while read filename
        do
                printf "${filename}\n"
        done
}

main

       printf "%s\n" "${filename}"

./scriptnname "directory name"