Returning a boolean from a Bash function

Question

I want to write a bash function that check if a file has certain properties and returns true or false. Then I can use it in my scripts in the \"if\". But what should I retur

Answer 1

Be careful when checking directory only with option -d !
if variable $1 is empty the check will still be successfull. To be sure, check also that the variable is not empty.

#! /bin/bash

is_directory(){

    if [[ -d $1 ]] && [[ -n $1 ]] ; then
        return 0
    else
        return 1
    fi

}


#Test
if is_directory $1 ; then
    echo "Directory exist"
else
    echo "Directory does not exist!" 
fi