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tldr/pages/common/test.md

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# test
> 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/coreutils/manual/html_node/test-invocation.html>.
- Test if a given variable is equal to a given string:
`test "{{$MY_VAR}}" = "{{/bin/zsh}}"`
- Test if a given variable is empty ([z]ero length):
`test -z "{{$GIT_BRANCH}}"`
- Test if a [f]ile exists:
`test -f "{{path/to/file_or_directory}}"`
- Test if a [d]irectory does not exist:
`test ! -d "{{path/to/directory}}"`
- If A is true, then do B, or C in the case of an error (notice that C may run even if A fails):
`test {{condition}} && {{echo "true"}} || {{echo "false"}}`