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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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)