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  • LINUX man pages
  • Linux Man Page Viewer


    The following form allows you to view linux man pages.

    Command:

    rl

    
    
    

    SYNOPSIS

           rl [OPTION]...  [FILE]...
    
    
    

    DESCRIPTION

           rl  reads  lines  from  a input file or stdin, randomizes the lines and
           outputs a specified number of lines.  It does this with only  a  single
           pass over the input while trying to use as little memory as possible.
    
           -c, --count=N
                  Select  the  number  of  lines to be returned in the output.  If
                  this argument is omitted all the  lines  in  the  file  will  be
                  returned in random order.  If the input contains less lines than
                  specified and the --reselect option below  is  not  specified  a
                  warning is printed and all lines are returned in random order.
    
           -r, --reselect
                  When  using  this  option a single line may be selected multiple
                  times.  The default behaviour is that any input line  will  only
                  be  selected  once.   This option makes it possible to specify a
                  --count option with more lines than the file actually holds.
    
           -o, --output=FILE
                  Send randomized lines to FILE instead of stdout.
    
           -d, --delimiter=DELIM
                  Use specified character as a "line"  delimiter  instead  of  the
                  newline character.
    
           -0, --null
                  Input  lines are terminated by a null character.  This option is
                  useful to process the output of the GNU find -print0 option.
    
           -n, --line-number
                  Output lines are numbered with the line number  from  the  input
                  file.
    
           -q, --quiet, --silent
                  Be quiet about any errors or warnings.
    
           -h, --help
                  Show short summary of options.
    
               seq 6 | rl --count 2
    
           Roll a dice 1000 times and see which number comes up more often:
               seq 6 | rl --reselect --count 1000 | sort | uniq -c | sort -n
    
           Shuffle the words of a sentence:
               echo -n "The rain in Spain stays mainly in the plain." \
                 | rl --delimiter=? ?;echo
    
           Find all movies and play them in random order.
               find . -name ?*.avi? -print0 | rl -0 | xargs -n 1 -0 mplayer
           Because  -0  is  used  filenames  with  spaces (even newlines and other
           unusual characters) in them work.
    
    
    

    BUGS

           The program currently does not have very smart memory  management.   If
           you  feed  it  huge files and expect it to fully randomize all lines it
           will completely read the file in memory. If  you  specify  the  --count
           option  it  will only use the memory required for storing the specified
           number of lines.  Improvements on this area are on the TODO list.
    
           The program uses the rand()  system  random  function.   This  function
           returns a number between 0 and RAND_MAX, which may not be very large on
           some systems.   This  will  result  in  non-random  results  for  files
           containing more lines than RAND_MAX.
    
           Note  that  if you specify multiple input files they are randomized per
           file.  This is a different result from when you cat all the  files  and
           pipe the result into rl.
    
    
    

    COPYRIGHT

           Copyright  (C)  2001,  2002, 2003, 2004, 2005, 2006, 2007, 2008 Arthur de
           Jong.
           This is free software; see the license for copying  conditions.   There
           is  NO  warranty;  not  even  for  MERCHANTABILITY  or  FITNESS  FOR  A
           PARTICULAR PURPOSE.
    
    
    

    Version 0.2.7 Jul 2008 rl(1)

    
    
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