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Full Discussion: Split File Based on Line Number Pattern
Top Forums Shell Programming and Scripting Split File Based on Line Number Pattern Post 302241854 by era on Tuesday 30th of September 2008 12:55:42 PM
Old 09-30-2008
Perl or Python looping over a set of file handles would seem like the most i efficient approach. For a more pedestrian solution, an awk script run four times with different parameters might be acceptable even if the file is big.

Does file four only contain every tenth line, and then 11, 14, and 17 go to the first file again?

Code:
perl -MIO::File -ne 'BEGIN { map { $file[$_] = IO::File->new(">file$_") || die $!} 0..3; 
  @m = (0, 1, 2, 0, 1, 2, 0, 1, 2, 3);
}
$file[$m[$. % 9]]->print || die $!'

csplit has some fairly versatile options, you might be able to pull this off simply with a suitable csplit pattern as well.
Last edited by era; 09-30-2008 at 01:56 PM.. Reason: csplit note
 

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LEARN ABOUT PLAN9

split

SPLIT(1)						      General Commands Manual							  SPLIT(1)

NAME

       split - split a file into pieces

SYNOPSIS

       split [ option ...  ] [ file ]

DESCRIPTION

       Split reads file (standard input by default) and writes it in pieces of 1000 lines per output file.  The names of the output files are xaa,
       xab, and so on to xzz.  The options are

       -n     Split into n-line pieces.

       -e expression
	      File divisions occur at each line that matches a regular expression; see regexp(6).  Multiple -e options may appear.   If  a  subex-
	      pression	of  expression is contained in parentheses (...), the output file name is the portion of the line which matches the subex-
	      pression.

       -f stem
	      Use stem instead of x in output file names.

       -s suffix
	      Append suffix to names identified under -e.

       -x     Exclude the matched input line from the output file.

       -i     Ignore case in option -e; force output file names (excluding the suffix) to lower case.

SOURCE

       /sys/src/cmd/split.c

SEE ALSO

       sed(1), awk(1) grep(1), regexp(6)

																	  SPLIT(1)
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