Check file types and compare values. Returns 0 if the…
Check file types and compare values. Returns 0 if the condition evaluates to true, 1 if it evaluates to false. More information: https://www.gnu.org/software/bash/manual/bash.html#index-_005b_005b.
[[ ${{variable}} {{==|!=}} "{{string}}" ]]
[[ ${{variable}} {{==|=~}} {{pattern}} ]]
[[ ${{variable}} -{{eq|ne|gt|lt|ge|le}} {{integer}} ]]
[[ -n ${{variable}} ]]
[[ -z ${{variable}} ]]
[[ -f {{path/to/file}} ]]
[[ -d {{path/to/directory}} ]]
[[ -e {{path/to/file_or_directory}} ]]