Originální popis anglicky:
break - exit from for, while, or until loop
Návod, kniha: POSIX Programmer's Manual
break [n]
The
break utility shall exit from the smallest enclosing
for,
while, or
until loop, if any; or from the
nth enclosing
loop if
n is specified. The value of
n is an unsigned decimal
integer greater than or equal to 1. The default shall be equivalent to
n=1. If
n is greater than the number of enclosing loops, the
outermost enclosing loop shall be exited. Execution shall continue with the
command immediately following the loop.
None.
See the DESCRIPTION.
Not used.
None.
None.
Default.
Not used.
The standard error shall be used only for diagnostic messages.
None.
None.
- 0
- Successful completion.
- >0
- The n value was not an unsigned decimal integer
greater than or equal to 1.
Default.
The following sections are informative.
None.
for i in * do
if test -d "$i" then break fi done
In early proposals, consideration was given to expanding the syntax of
break and
continue to refer to a label associated with the
appropriate loop as a preferable alternative to the
n method. However,
this volume of IEEE Std 1003.1-2001 does reserve the name space
of command names ending with a colon. It is anticipated that a future
implementation could take advantage of this and provide something like:
outofloop: for i in a b c d e
do
for j in 0 1 2 3 4 5 6 7 8 9
do
if test -r "${i}${j}"
then break outofloop
fi
done
done
and that this might be standardized after implementation experience is achieved.
None.
Special Built-In Utilities
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
.
