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Top Forums Shell Programming and Scripting split file by delimiter with csplit Post 302680257 by drl on Wednesday 1st of August 2012 02:28:59 PM
Old 08-01-2012
Hi.

There is some preliminary coding to display my environment. The core of the solution is:
Code:
bunch input file into super lines -> split into separate files of n (=2 in this demo) -> expand the individual files

The bunching is done with an awk script, gather. Each "bunch" starts with (is separated by), RS=">", the Record Separator. For all the newlines in the bunch, replace the newlines with "=". That creates "super lines".

The split works on lines, so that it does not know that there are really many lines in a super line. For each group of n (=2) super lines, split will write to a new file, xaa, xab, etc.

For all those files xa*, replace "=" with newlines, and re-write the files.

Note that this is a demonstration of a technique. There are certainly other solutions.

Viola! ... cheers, drl
 

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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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