exit man page

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.

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.

Operands

See the Description.

Stdin

Not used.

Asynchronous Events

Default.

Stdout

Not used.

Stderr

The standard error shall be used only for diagnostic messages.

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.

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.

See Also

Section 2.14, Special Built-In Utilities

Info

2013 IEEE/The Open Group POSIX Programmer's Manual