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Evaluate condition. Returns 0 if the condition evaluates to true, 1 if it evaluates to false. More information: https://www.gnu.org/software/coreutils/test.

Test if a given variable is equal to a given string:

[ "{{$VARIABLE}}" == "{{/bin/zsh}}" ]

Test if a given variable is empty:

[ -z "{{$GIT_BRANCH}}" ]

Test if a file exists:

[ -f "{{path/to/file}}" ]

Test if a directory does not exist:

[ ! -d "{{path/to/directory}}" ]

If-else statement:

[ {{condition}} ] && {{echo "true"}} || {{echo "false"}}