Linux
w_err=0
w_err=$(($w_err+$?))
exit $w_err
Windows
set /a w_err=0
set /a w_err=%w_err%+%errorlevel%
exit /B %w_err%
Robocopy
set /a w_err=8
set /a w_err=%w_err%+%errorlevel%
traitement
set /a w_err=%w_err%-8
exit /B %w_err%
Un site utilisant WordPress
w_err=0
w_err=$(($w_err+$?))
exit $w_err
set /a w_err=0
set /a w_err=%w_err%+%errorlevel%
exit /B %w_err%
set /a w_err=8
set /a w_err=%w_err%+%errorlevel%
traitement
set /a w_err=%w_err%-8
exit /B %w_err%