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 .