9d865abee1
* [: use posix-compliant example for equals comparison the previous example worked fine for bash, but some other shells (zsh, in my case) will not work when using "==" for comparison. the posix spec only requires "=", so I think it makes a little more sense to use that in the example. * test: use posix-compliant example for equals comparison the previous example worked fine for bash, but some other shells (zsh, in my case) will not work when using "==" for comparison. the posix spec only requires "=", so I think it makes a little more sense to use that in the example.
34 lines
952 B
Markdown
34 lines
952 B
Markdown
# [
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> Check file types and compare values.
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> Returns a status of 0 if the condition evaluates to true, 1 if it evaluates to false.
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> More information: <https://www.gnu.org/software/bash/manual/bash.html#index-test>.
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- Test if a given variable is equal/not equal to the specified string:
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`[ "${{variable}}" {{=|!=}} "{{string}}" ]`
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- Test if a given variable is [eq]ual/[n]ot [e]qual/[g]reater [t]han/[l]ess [t]han/[g]reater than or [e]qual/[l]ess than or [e]qual to the specified number:
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`[ "${{variable}}" -{{eq|ne|gt|lt|ge|le}} {{integer}} ]`
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- Test if the specified variable has a [n]on-empty value:
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`[ -n "${{variable}}" ]`
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- Test if the specified variable has an empty value:
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`[ -z "${{variable}}" ]`
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- Test if the specified [f]ile exists:
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`[ -f {{path/to/file}} ]`
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- Test if the specified [d]irectory exists:
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`[ -d {{path/to/directory}} ]`
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- Test if the specified file or directory [e]xists:
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`[ -e {{path/to/file_or_directory}} ]`
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