(coreutils.info)Conditions

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Enter node , (file) or (file)node

16 Conditions
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This section describes commands that are primarily useful for their exit
status, rather than their output.  Thus, they are often used as the
condition of shell ‘if’ statements, or as the last command in a
pipeline.

false invocation

Do nothing, unsuccessfully.

true invocation

Do nothing, successfully.

test invocation

Check file types and compare values.

expr invocation

Evaluate expressions.