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