Split "-n" unknown option Post: 302982549

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Homework and Emergencies Emergency UNIX and Linux Support Split "-n" unknown option Post 302982549 by otheus on Thursday 29th of September 2016 08:00:08 PM

09-29-2016

Registered User

So, just upgrade to latest coreutils version.

What -n r/K/N does is print every K/Nth line. If K = 1 and N =2, you the first line, then every 2nd line after to the end of the stream. With K = 1 and N = 4, you get the first line, then every 4th line after. This is easy enough to replicate with any of the other tools. I think sed would be the best, but my sed-foo is weak, so I'll use awk.

Code:

split() { 
 if [ "$1" = "-n" -a "${2:0:1}" = "r" ]; then
   local k="${2:2:1}"
   local n="${2##*/}"
   shift; shift;
   if [ "${1#-}" != "$1" ] ; then
     echo >&2 "Warning: additional options to split need to be handled by this function"
   fi
   awk -v k=$k -v n=$n '(NR%n)==(k%n)' "$@"
 else
   command split "$@"
 fi
}

I tested the above code using a 3-way split against a large input file and compared it to GNU split v 8.21.

If they pass other options to split, you'll have to implement those or work around them.

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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)