Conditions (GNU Coreutils 9.0)

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16 Conditions

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.