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BREAK(1P) POSIX Programmer's Manual BREAK(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.
break — exit from for, while, or until loop
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 "$i"
then break
fi
done
In early proposals, consideration was given to expanding the syntax
of break and continue to refer to a label associated with the
appropriate loop as a preferable alternative to the n method.
However, this volume of POSIX.1‐2008 does reserve the name space of
command names ending with a <colon>. It is anticipated that a future
implementation could take advantage of this and provide something
like:
outofloop: for i in a b c d e
do
for j in 0 1 2 3 4 5 6 7 8 9
do
if test −r "${i}${j}"
then break outofloop
fi
done
done
and that this might be standardized after implementation experience
is achieved.
None.
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 .
Any typographical or formatting errors that appear in this page are
most likely to have been introduced during the conversion of the
source files to man page format. To report such errors, see
https://www.kernel.org/doc/man-pages/reporting_bugs.html .
IEEE/The Open Group 2013 BREAK(1P)
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