Интерактивная система просмотра системных руководств (man-ов)
return (1)
return (1) ( Solaris man: Команды и прикладные программы пользовательского уровня )
return (1) ( Linux man: Команды и прикладные программы пользовательского уровня )
>> return (1) ( POSIX man: Команды и прикладные программы пользовательского уровня )
NAME
return - return from a function
SYNOPSIS
return[n]
DESCRIPTION
The return utility shall cause the shell to stop executing the
current function or dot script. If the shell is not currently
executing a function or dot script, the results are unspecified.
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 value of the special parameter '?' shall be set to n,
an unsigned decimal integer, or to the exit status of
the last command executed if n is not specified. If the value
of n is greater than 255, the results are undefined.
When return 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
None.
RATIONALE
The behavior of return when not in a function or dot 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
exit.
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 exit
.
FUTURE DIRECTIONS
None.
SEE ALSO
Special Built-In Utilities
COPYRIGHT
Portions of this text are reprinted and reproduced in electronic form
from IEEE Std 1003.1, 2003 Edition, Standard for Information Technology
-- Portable Operating System Interface (POSIX), The Open Group Base
Specifications Issue 6, Copyright (C) 2001-2003 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
http://www.opengroup.org/unix/online.html .
