xenial (1) exit.1posix.gz

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PROLOG
       This  manual  page  is part of the POSIX Programmer's Manual.  The Linux implementation of this interface
       may differ (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  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
       Section 2.14, Special Built-In Utilities


       Portions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1, 2013 Edition,
       Standard for Information Technology -- Portable Operating System Interface (POSIX), The Open  Group  Base
       Specifications  Issue 7, Copyright (C) 2013 by the Institute of Electrical and Electronics Engineers, Inc
       and The Open Group.  (This is POSIX.1-2008 with the 2013 Technical Corrigendum 1 applied.) 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.unix.org/online.html .

       Any  typographical  or formatting errors that appear in this page are most likely to have been introduced
       during  the  conversion  of  the  source  files  to  man  page  format.  To  report  such   errors,   see
       https://www.kernel.org/doc/man-pages/reporting_bugs.html .