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Интерактивная система просмотра системных руководств (man-ов)

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break (1)
  • break (1) ( Solaris man: Команды и прикладные программы пользовательского уровня )
  • break (1) ( FreeBSD man: Команды и прикладные программы пользовательского уровня )
  • break (1) ( Linux man: Команды и прикладные программы пользовательского уровня )
  • >> break (1) ( POSIX man: Команды и прикладные программы пользовательского уровня )
  • break (2) ( Русские man: Системные вызовы )
  • break (2) ( Linux man: Системные вызовы )
  •  

    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  

    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 .


     

    Index

    NAME
    SYNOPSIS
    DESCRIPTION
    OPTIONS
    OPERANDS
    STDIN
    INPUT FILES
    ENVIRONMENT VARIABLES
    ASYNCHRONOUS EVENTS
    STDOUT
    STDERR
    OUTPUT FILES
    EXTENDED DESCRIPTION
    EXIT STATUS
    CONSEQUENCES OF ERRORS
    APPLICATION USAGE
    EXAMPLES
    RATIONALE
    FUTURE DIRECTIONS
    SEE ALSO
    COPYRIGHT


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