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    The following form allows you to view linux man pages.

    Command:

    unbuffer

    
    
    

    SYNOPSIS

           unbuffer program [ args ]
    
    
    

    INTRODUCTION

           unbuffer  disables the output buffering that occurs when program output
           is redirected from non-interactive programs.  For example, suppose  you
           are  watching  the output from a fifo by running it through od and then
           more.
    
                od -c /tmp/fifo | more
    
           You will not see anything until a full page of  output  has  been  pro-
           duced.
    
           You can disable this automatic buffering as follows:
    
                unbuffer od -c /tmp/fifo | more
    
           Normally,  unbuffer  does  not read from stdin.  This simplifies use of
           unbuffer in some situations.  To use unbuffer in a pipeline, use the -p
           flag.  Example:
    
                   process1 | unbuffer -p process2 | process3
    
    
    

    CAVEATS

           unbuffer  -p  may appear to work incorrectly if a process feeding input
           to unbuffer exits.  Consider:
                   process1 | unbuffer -p process2 | process3
    
           If process1 exits, process2 may not yet have finished.  It is  impossi-
           ble for unbuffer to know long to wait for process2 and process2 may not
           ever finish, for example, if it is a filter.  For expediency,  unbuffer
           simply  exits  when  it encounters an EOF from either its input or pro-
           cess2.
    
           In order to have a version of unbuffer that worked in  all  situations,
           an  oracle  would  be  necessary.   If you want an application-specific
           solution, workarounds or hand-coded Expect may be more  suitable.   For
           example,  the  following example shows how to allow grep to finish pro-
           cessing when the cat before it finishes first.  Using cat to feed  grep
           would  never require unbuffer in real life.  It is merely a placeholder
           for some imaginary process that may or may not finish.  Similarly,  the
           final  cat at the end of the pipeline is also a placeholder for another
           process.
    
           $ cat /tmp/abcdef.log | grep abc | cat
           abcdef
           xxxabc defxxx
           $ cat /tmp/abcdef.log | unbuffer grep abc | cat
           $ (cat /tmp/abcdef.log ; sleep 1) | unbuffer grep abc | cat
    
                                      1 June 1994                      UNBUFFER(1)
    
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