EXIT(1P)                                            POSIX Programmer's Manual                                           EXIT(1P)



PROLOG
       This  manual  page is part of the POSIX Programmer's Manual.  The Linux implementation of this interface may differ (con-
       sult the corresponding Linux manual page for details of Linux behavior), or the  interface  may  not  be  implemented  on
       Linux.

NAME
       exit - cause the shell to exit

SYNOPSIS
       exit [n]

DESCRIPTION
       The exit utility shall cause the shell to exit with the exit status specified by the unsigned decimal integer n.  If n is
       specified, but its value is not between 0 and 255 inclusively, the exit status is undefined.

       A trap on EXIT shall be executed before the shell terminates, except when the  exit  utility  is  invoked  in  that  trap
       itself, in which case the shell shall exit immediately.

OPTIONS
       None.

OPERANDS
       See the DESCRIPTION.

STDIN
       Not used.

INPUT FILES
       None.

ENVIRONMENT VARIABLES
       None.

ASYNCHRONOUS EVENTS
       Default.

STDOUT
       Not used.

STDERR
       The standard error shall be used only for diagnostic messages.

OUTPUT FILES
       None.

EXTENDED DESCRIPTION
       None.

EXIT STATUS
       The  exit  status shall be n, if specified. Otherwise, the value shall be the exit value of the last command executed, or
       zero if no command was executed. When exit is executed in a trap action, the last command is considered to be the command
       that executed immediately preceding the trap action.

CONSEQUENCES OF ERRORS
       Default.

       The following sections are informative.

APPLICATION USAGE
       None.

EXAMPLES
       Exit with a true value:


              exit 0

       Exit with a false value:


              exit 1

RATIONALE
       As  explained  in  other  sections,  certain exit status values have been reserved for special uses and should be used by
       applications only for those purposes:

        126   A file to be executed was found, but it was not an executable utility.

        127   A utility to be executed was not found.

       >128   A command was interrupted by a signal.


FUTURE DIRECTIONS
       None.

SEE ALSO
       Special Built-In Utilities

COPYRIGHT
       Portions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1, 2003  Edition,  Standard  for
       Information  Technology -- Portable Operating System Interface (POSIX), The Open Group Base Specifications Issue 6, Copy-
       right (C) 2001-2003 by the Institute of Electrical and Electronics Engineers, Inc and The Open Group. In the event of any
       discrepancy  between this version and the original IEEE and The Open Group Standard, the original IEEE and The Open Group
       Standard  is  the  referee   document.   The   original   Standard   can   be   obtained   online   at   http://www.open-
       group.org/unix/online.html .



IEEE/The Open Group                                           2003                                                      EXIT(1P)