Rdb: Ruby-Nachbau der MWC /rdb-Werkzeuge

man/not.man

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+.TH not "" "" "/rdb Command"
+.PC "Logical not, to reverse return status of command"
+\fBnot \fIcommand ...\fR
+.PP
+.II "return value^invert"
+.II "logical NOT"
+The command
+.B not
+converts a return status of zero to 255, and any nonzero
+return status to zero.
+Thus, true becomes false and vice versa.
+This is used to test a command for not true or false.
+.SH Example
+This example shows how
+.B not
+reverses the return code of the COHERENT command
+.BR true :
+.DM
+	true ; echo $?
+.DE
+.PP
+This command returns zero.
+On the other hand, the command
+.DM
+	not true ; echo $?
+.DE
+.PP
+returns 255.
+.SH "See Also"
+COHERENT Lexicon:
+.B
+false,
+true
+.R
+.SO not