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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 dif-
       fer (consult 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 exe-
       cuted, or zero if no command was executed. When exit is executed in a trap action, the last command is  consid-
       ered 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, Stan-
       dard  for Information Technology -- Portable Operating System Interface (POSIX), The Open Group Base Specifica-
       tions Issue 6, Copyright (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 Stan-
       dard, the original IEEE and The Open Group Standard is the referee  document.  The  original  Standard  can  be
       obtained online at http://www.opengroup.org/unix/online.html .



IEEE/The Open Group                  2003                             EXIT(1P)