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Top Forums Shell Programming and Scripting Split File based on number of rows Post 302926287 by Chubler_XL on Saturday 22nd of November 2014 05:49:50 PM
Old 11-22-2014
on AIX you could try something like the below script.

Code:
cd /fol1/fol2 
for file in *.dat
do
   SIZE=$(istat "$file"| awk '/Length/ {print $(NF-1)}')
   if [ $SIZE -gt 90000000000 ]
   then
       LINES=$(wc -l < "$file")
       let AVG=SIZE/LINES
       let SPLIT=5000000000/AVG
       split -l $SPLIT -a1 --verbose "$file" "TT_$file"
   fi
done

Note this reads the file twice (once to calculate the number of lines and once to split the file up), also using the average line size is quite inaccurate and shell integer arithmetic could make this even more hit-and-miss. You may be better off writing a tailor split command in awk.
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SPLIT(1)							   User Commands							  SPLIT(1)

NAME
split - split a file into pieces SYNOPSIS
split [OPTION]... [INPUT [PREFIX]] DESCRIPTION
Output fixed-size pieces of INPUT to PREFIXaa, PREFIXab, ...; default size is 1000 lines, and default PREFIX is `x'. With no INPUT, or when INPUT is -, read standard input. Mandatory arguments to long options are mandatory for short options too. -a, --suffix-length=N use suffixes of length N (default 2) -b, --bytes=SIZE put SIZE bytes per output file -C, --line-bytes=SIZE put at most SIZE bytes of lines per output file -d, --numeric-suffixes use numeric suffixes instead of alphabetic -l, --lines=NUMBER put NUMBER lines per output file --verbose print a diagnostic just before each output file is opened --help display this help and exit --version output version information and exit SIZE may have a multiplier suffix: b 512, kB 1000, K 1024, MB 1000*1000, M 1024*1024, GB 1000*1000*1000, G 1024*1024*1024, and so on for T, P, E, Z, Y. AUTHOR
Written by Torbjorn Granlund and Richard M. Stallman. REPORTING BUGS
Report split bugs to bug-coreutils@gnu.org GNU coreutils home page: <http://www.gnu.org/software/coreutils/> General help using GNU software: <http://www.gnu.org/gethelp/> COPYRIGHT
Copyright (C) 2009 Free Software Foundation, Inc. License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>. This is free software: you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law. SEE ALSO
The full documentation for split is maintained as a Texinfo manual. If the info and split programs are properly installed at your site, the command info coreutils 'split invocation' should give you access to the complete manual. GNU coreutils 7.1 July 2010 SPLIT(1)
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