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[[

Check file types and compare values.
Returns 0 if the condition evaluates to true, 1 if it evaluates to false.

More information.

[[ ${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} ]]
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