Question

I am writing a bash script that will output a .tgz file to a specific directory, /tmp/ by default
I would like to provide an option to override this directory and I have chosen to do so using arguments provided at the command line

    while getopts d: option
    do
    case "${option}" in
    d) dir=${OPTARG};;
    esac
    done

As written, this works but I’ve run into a snag depending on user input
The name of my .tgz file is also a variable and my code that brings this all together is

    output="$dir""$name"

The problem that I run into is if the user runs

    ./script -d /home/user

My resulting path and filename end up as

    /home/userfilename.tgz

I need to either enforce a requirement for a trailing / or insert one if the user did not.
While it works, if I change my output variable to

    output="$dir"/"$name"

If the user does provide a trailing / I end up with something like this and I am trying to keep my output aesthetic.

    /home/user//filename.tgz

Any input would be greatly appreciated.

Answer 1

Add the line

output="${output//\/\///}"

after joining dir and name.

It looks complicated, but what it does is it replaces two slashes with one.

You may find more info in here.