dnl @ ../doc/m4.texinfo:4039: Origin of test
dnl @ Copyright (C) 2006 Free Software Foundation
dnl @ This file is free software; the Free Software Foundation
dnl @ gives unlimited permission to copy and/or distribute it
dnl @ with or without modifications, as long as this notice
dnl @ is preserved.
syscmd(`false')
dnl @result{}
ifelse(sysval, `0', `zero', `non-zero')
dnl @result{}non-zero
syscmd(`exit 2')
dnl @result{}
sysval
dnl @result{}2
syscmd(`true')
dnl @result{}
sysval
dnl @result{}0
esyscmd(`false')
dnl @result{}
ifelse(sysval, `0', `zero', `non-zero')
dnl @result{}non-zero
esyscmd(`exit 2')
dnl @result{}
sysval
dnl @result{}2
esyscmd(`true')
dnl @result{}
sysval
dnl @result{}0