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Top Forums UNIX for Dummies Questions & Answers Explanation on problem "match" function awk Post 302812303 by RudiC on Saturday 25th of May 2013 04:54:01 PM
Old 05-25-2013
Hmmmm - the requestor didn't ask for alternative solutions, he asked to explain why that "strange" behaviour occurred (which, btw, is not strange but correct). Let's go and try: According to the gawk man page, the array f will be filled with "the matches". The first match ( f[1] ) is being used as a separator in the following split, and then the chars before the first match (array[1]) will be substituted with "".
If there's no match, like in the second line, f will be empty, and split will use an empty separator, resulting in a per char split. array[1] will then hold the "S" which will be removed.
Logical, understandable?
 

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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)
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