1 1 16 Conditions 1 ************* 1 1 This section describes commands that are primarily useful for their exit 1 status, rather than their output. Thus, they are often used as the 1 condition of shell ‘if’ statements, or as the last command in a 1 pipeline. 1
1 · false invocation Do nothing, unsuccessfully. · true invocation Do nothing, successfully. · test invocation Check file types and compare values. · expr invocation Evaluate expressions. 1