1BREAK(1P) POSIX Programmer's Manual BREAK(1P)
2
6 This manual page is part of the POSIX Programmer's Manual. The Linux
7 implementation of this interface may differ (consult the corresponding
8 Linux manual page for details of Linux behavior), or the interface may
9 not be implemented on Linux.
10
13 break — exit from for, while, or until loop
14
16 break [n]
17
19 The break utility shall exit from the smallest enclosing for, while, or
20 until loop, if any; or from the nth enclosing loop if n is specified.
21 The value of n is an unsigned decimal integer greater than or equal to
22 1. The default shall be equivalent to n=1. If n is greater than the
23 number of enclosing loops, the outermost enclosing loop shall be
24 exited. Execution shall continue with the command immediately following
25 the loop.
26
28 None.
29
31 See the DESCRIPTION.
32
34 Not used.
35
37 None.
38
40 None.
41
43 Default.
44
46 Not used.
47
49 The standard error shall be used only for diagnostic messages.
50
52 None.
53
55 None.
56
58 0 Successful completion.
59 >0 The n value was not an unsigned decimal integer greater than or
61 equal to 1.
62
64 Default.
65 The following sections are informative.
67
69 None.
70
72 for i in *
73 do
74 if test −d "$i"
75 then break
76 fi
77 done
78
80 In early proposals, consideration was given to expanding the syntax of
81 break and continue to refer to a label associated with the appropriate
82 loop as a preferable alternative to the n method. However, this volume
83 of POSIX.1‐2008 does reserve the name space of command names ending
84 with a <colon>. It is anticipated that a future implementation could
85 take advantage of this and provide something like:
86 outofloop: for i in a b c d e
88 do
89 for j in 0 1 2 3 4 5 6 7 8 9
90 do
91 if test −r "${i}${j}"
92 then break outofloop
93 fi
94 done
95 done
96 and that this might be standardized after implementation experience is
98 achieved.
99
101 None.
102
104 Section 2.14, Special Built-In Utilities
105
107 Portions of this text are reprinted and reproduced in electronic form
108 from IEEE Std 1003.1, 2013 Edition, Standard for Information Technology
109 -- Portable Operating System Interface (POSIX), The Open Group Base
110 Specifications Issue 7, Copyright (C) 2013 by the Institute of Electri‐
111 cal and Electronics Engineers, Inc and The Open Group. (This is
112 POSIX.1-2008 with the 2013 Technical Corrigendum 1 applied.) In the
113 event of any discrepancy between this version and the original IEEE and
114 The Open Group Standard, the original IEEE and The Open Group Standard
115 is the referee document. The original Standard can be obtained online
116 at http://www.unix.org/online.html .
117 Any typographical or formatting errors that appear in this page are
119 most likely to have been introduced during the conversion of the source
120 files to man page format. To report such errors, see https://www.ker‐
121 nel.org/doc/man-pages/reporting_bugs.html .
122IEEE/The Open Group 2013 BREAK(1P)