what does this do? if [[ -n "${ENV_VAR}" ]]

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http://www.unix.com – Hi Guys! What does this do? Code: if [[ -n "${ENV_VAR}" ]] what does -n option do here? I can't find the explanation using man test. Thanks in advance! Moderator's Comments: Please view this code tag video for how to use code tags when posting code and data. (HowTos)