Section: POSIX Programmer's Manual (1P)
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.
--- return from a function or dot script
utility shall cause the shell to stop executing the current function or
script. If the shell is not currently executing a function or
script, the results are unspecified.
See the DESCRIPTION.
The standard error shall be used only for diagnostic messages.
The value of the special parameter
shall be set to
an unsigned decimal integer, or to the exit status of the last command
is not specified. If
is not an unsigned decimal integer, or is greater than 255, the
results are unspecified. When
is executed in a
action, the last command is considered to be the command that
executed immediately preceding the
CONSEQUENCES OF ERRORS
The following sections are informative.
The behavior of
when not in a function or
script differs between the System V shell and the KornShell. In the
System V shell this is an error, whereas in the KornShell, the effect
is the same as
The results of returning a number greater than 255 are undefined
because of differing practices in the various historical
implementations. Some shells AND out all but the low-order 8 bits;
others allow larger values, but not of unlimited size.
See the discussion of appropriate exit status values under
, Function Definition Command,
, Special Built-In Utilities,
Portions of this text are reprinted and reproduced in electronic form
from IEEE Std 1003.1-2017, Standard for Information Technology
-- Portable Operating System Interface (POSIX), The Open Group Base
Specifications Issue 7, 2018 Edition,
Copyright (C) 2018 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
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