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Linux 2.6 - man page for exit (linux section 1posix)

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

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, 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
       Standard, the original IEEE and The Open Group Standard is the referee document. The orig-
       inal Standard can be obtained online at http://www.opengroup.org/unix/online.html .

IEEE/The Open Group			       2003					  EXIT(P)


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