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
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
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.
The standard error shall be used only for diagnostic messages.
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.
The following sections are informative.
Exit with a true value:
Exit with a false value:
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:
Section 2.14, Special Built-In Utilities
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 .
- A file to be executed was found, but it was not an executable
- A utility to be executed was not found.
- A command was interrupted by a signal.
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