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 DEBIAN

flow-split

flow-split(1)						      General Commands Manual						     flow-split(1)

NAME

       flow-split -- Split flow files into smaller files.

SYNOPSIS

       flow-split [-gGhn]  [-b big|little]  [-C comment]  [-d debug_level]  [-N nflows]  [-o outfile_basename]	[-T nseconds]  [-z z_level]

DESCRIPTION

       The flow-split utility will split a flow file into smaller files based on the the number of flows or the ammount of time that has passed.

OPTIONS

       -b big|little
		 Byte order of output.

       -C Comment
		 Add a comment.

       -d debug_level
		 Enable debugging.

       -g	 Split on source tag.

       -G	 Split on destination tag.

       -h	 Display help.

       -n	 Use symbols for tag field in filename.

       -N nflows Split after processing nflows.

       -o outfile_basename
		 The basename of the resulting files.

       -T nsecond
		 Split after processing an interval of nseconds flows.

       -z z_level
		 Configure compression level to  z_level.  0 is disabled (no compression), 9 is highest compression.

EXAMPLES

       Create 1 minute flow files from the flow archive in /flows/krc4.  Store the results in /flows/krc4.split

	 flow-cat /flows/krc4 | flow-split -T60 -o /flows/krc4.split/1min.

BUGS

       None known.

AUTHOR

       Mark Fullmer maf@splintered.net

SEE ALSO

       flow-tools(1)

																     flow-split(1)