[[

Check file types and compare values.

Returns 0 if the condition evaluates to true, 1 if it evaluates to false.

=> More information.

• Test if a given variable is equal/not equal to the specified string:

[[ ${variable} {==|!=} "{string}" ]]

• Test if a given string conforms the specified glob/regex:

[[ ${variable} {==|=~} {pattern} ]]

• Test if a given variable is [eq]ual/[n]ot [e]qual/[g]reater [t]han/[l]ess [t]han/[g]reater than or [e]qual/[l]ess than or [e]qual to the specified number:

[[ ${variable} -{eq|ne|gt|lt|ge|le} {integer} ]]

• Test if the specified variable has a [n]on-empty value:

[[ -n ${variable} ]]

• Test if the specified variable has an empty value:

[[ -z ${variable} ]]

• Test if the specified [f]ile exists:

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

• Test if the specified [d]irectory exists:

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

• Test if the specified file or directory [e]xists:

[[ -e {path/to/file_or_directory} ]]

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