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.TH EXIT "1P" 2013 "IEEE/The Open Group" "POSIX Programmer's Manual"

.SH 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.

.SH NAME

exit

\(em cause the shell to exit

.SH SYNOPSIS

.LP

.nf

exit \fB[\fIn\fB]\fR

.fi

.SH DESCRIPTION

The

.IR exit

utility shall cause the shell to exit with the exit status specified

by the unsigned decimal integer

.IR n .

If

.IR n

is specified, but its value is not between 0 and 255 inclusively, the

exit status is undefined.

.P

A

.IR trap

on

.BR EXIT

shall be executed before the shell terminates, except when the

.IR exit

utility is invoked in that

.IR trap

itself, in which case the shell shall exit immediately.

.SH OPTIONS

None.

.SH OPERANDS

See the DESCRIPTION.

.SH STDIN

Not used.

.SH "INPUT FILES"

None.

.SH "ENVIRONMENT VARIABLES"

None.

.SH "ASYNCHRONOUS EVENTS"

Default.

.SH STDOUT

Not used.

.SH STDERR

The standard error shall be used only for diagnostic messages.

.SH "OUTPUT FILES"

None.

.SH "EXTENDED DESCRIPTION"

None.

.SH "EXIT STATUS"

The exit status shall be

.IR n ,

if specified. Otherwise, the value shall be the exit value of the last

command executed, or zero if no command was executed. When

.IR exit

is executed in a

.IR trap

action, the last command is considered to be the command that executed

immediately preceding the

.IR trap

action.

.SH "CONSEQUENCES OF ERRORS"

Default.

.LP

.IR "The following sections are informative."

.SH "APPLICATION USAGE"

None.

.SH EXAMPLES

Exit with a

.IR true

value:

.sp

.RS 4

.nf

\fB

exit 0

.fi \fR

.P

.RE

.P

Exit with a

.IR false

value:

.sp

.RS 4

.nf

\fB

exit 1

.fi \fR

.P

.RE

.SH "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:

.IP "\0126" 8

A file to be executed was found, but it was not an executable utility.

.IP "\0127" 8

A utility to be executed was not found.

.IP >128 8

A command was interrupted by a signal.

.SH "FUTURE DIRECTIONS"

None.

.SH "SEE ALSO"

.IR "Section 2.14" ", " "Special Built-In Utilities"

.SH 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 .