except.1

linux下qmail的源码 本人加了一些注释

.TH except 1
.SH NAME
except \- reverse the exit code of a program
.SH SYNOPSIS
.B except
.I program
[
.I arg ...
]
.SH DESCRIPTION
.B except
runs
.I program
with the given arguments.

If
.I program
exits 0,
.B except
exits 100.
If
.I program
exits 111,
.B except
exits 111.
If
.I program
exits anything else,
.B except
exits 0.
.SH "SEE ALSO"
bouncesaying(1),
condredirect(1)