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Интерактивная система просмотра системных руководств (man-ов)

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true (1)
  • true (1) ( Solaris man: Команды и прикладные программы пользовательского уровня )
  • true (1) ( FreeBSD man: Команды и прикладные программы пользовательского уровня )
  • true (1) ( Русские man: Команды и прикладные программы пользовательского уровня )
  • true (1) ( Linux man: Команды и прикладные программы пользовательского уровня )
  • >> true (1) ( POSIX man: Команды и прикладные программы пользовательского уровня )
  •  

    NAME

    true - return true value
     
    

    SYNOPSIS

    true  

    DESCRIPTION

    The true utility shall return with exit code zero.  

    OPTIONS

    None.  

    OPERANDS

    None.  

    STDIN

    Not used.  

    INPUT FILES

    None.  

    ENVIRONMENT VARIABLES

    None.  

    ASYNCHRONOUS EVENTS

    Default.  

    STDOUT

    Not used.  

    STDERR

    Not used.  

    OUTPUT FILES

    None.  

    EXTENDED DESCRIPTION

    None.  

    EXIT STATUS

    Zero.  

    CONSEQUENCES OF ERRORS

    None.

    The following sections are informative.  

    APPLICATION USAGE

    This utility is typically used in shell scripts, as shown in the EXAMPLES section. The special built-in utility : is sometimes more efficient than true.  

    EXAMPLES

    This command is executed forever:

    
    while true
    do
        command
    done
    
    
     

    RATIONALE

    The true utility has been retained in this volume of IEEE Std 1003.1-2001, even though the shell special built-in : provides similar functionality, because true is widely used in historical scripts and is less cryptic to novice script readers.  

    FUTURE DIRECTIONS

    None.  

    SEE ALSO

    false , Shell Commands  

    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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