true.1

来自「<B>Digital的Unix操作系统VAX 4.2源码</B>」· 1 代码 · 共 34 行

.\" SCCSID: @(#)true.1	8.1	9/11/90
.TH true 1
.SH Name
true, false \- provide test for status values
.SH Syntax
.B true
.br
.B false
.SH Description
.NXR "false command"
.NXR "true command"
.NXA "sh command interpreter" "false command"
.NXR "Bourne shell" "sh command interpreter"
The
.PN true
and
.PN false
commands are usually used in a Bourne shell script.
They test for the appropriate status "true" or "false" before running 
(or failing to run) a list of commands.  
.SH Examples
.EX
while true 
do
     command list 
done
.EE
.SH Diagnostics
The
.PN true 
command has exit status zero.
.SH See Also
csh(1), sh(1)