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true and false (commands)
open-in-new
<p>In <a href="/facts/Unix-like/YAKrAxzd">Unix-like</a> <a href="/facts/Operating_system/8XTuvMh2">operating systems</a>, true and false are commands whose only function is to always return with a predetermined <a href="/facts/Exit_status/V3uTvuNo">exit status</a>. Programmers and scripts often use the exit status of a command to assess success (exit status zero) or failure (non-zero) of the command. The true and false commands represent the <a href="/facts/Logical_value/SY4e2w8l">logical values</a> of command success, because <i>true</i> returns 0, and <i>false</i> returns 1. </p>