prevent loop from executing if variable is set [duplicate]

Question

I want to to execute an if statement a variable is set. I'm using bash.

Can I just use this statement:

if  [[ "$user_lives_here" ]]; then

Or is it better to use something like:

if  [[ ! -z "$user_lives_here" ]]; then

hek2mgl · Accepted Answer · 2018-08-07 14:33:23Z

1

You can use

if [[ -v user_lives_here ]]  ; then
    echo "variable is set"
else
    echo "variable is not set"
fi

answered Aug 7, 2018 at 14:33

hek2mgl

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1 Comment

...if you have Bash 4.2 or newer.