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

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 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 original Standard can be obtained online at http://www.opengroup.org/unix/online.html .

IEEE/The Open Group 2003 EXIT(P)