trusty (1) break.1posix.gz

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NAME
       break - exit from for, while, or until loop


SYNOPSIS
       break [n]


DESCRIPTION
       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.


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
        0     Successful completion.

       >0     The n value was not an unsigned decimal integer greater than or equal to 1.


CONSEQUENCES OF ERRORS
       Default.

       The following sections are informative.


APPLICATION USAGE
       None.


EXAMPLES
              for i in * do
                  if test -d "$i" then break fi done


RATIONALE
       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.


FUTURE DIRECTIONS
       None.


SEE ALSO
       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 .