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EXIT

Section: POSIX Programmer's Manual (1P)
Updated: 2013
Index Return to Main Contents
 

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  

COPYRIGHT

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 .


 

Index

PROLOG
NAME
SYNOPSIS
DESCRIPTION
OPTIONS
OPERANDS
STDIN
INPUT FILES
ENVIRONMENT VARIABLES
ASYNCHRONOUS EVENTS
STDOUT
STDERR
OUTPUT FILES
EXTENDED DESCRIPTION
EXIT STATUS
CONSEQUENCES OF ERRORS
APPLICATION USAGE
EXAMPLES
RATIONALE
FUTURE DIRECTIONS
SEE ALSO
COPYRIGHT


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