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Top Forums UNIX for Dummies Questions & Answers Split a file with no pattern -- Split, Csplit, Awk Post 302151318 by jim mcnamara on Friday 14th of December 2007 12:14:32 PM
Old 12-14-2007
If disk i/o is not making split "too slow" then try awk. But you should consider that a big I/O request queue length on that filesystem is a likely candidate for slow splitting, rather than split being a bad performer.
awk version of split:
Code:
awk ' {
          if(NR<300000) { print $0 > "smallfile1"}
          if (NR>300000 && NR < 600000) { print $0 > "smallfile2" }
          if (NR>60000) {print $0 > "smallfile3" }
       }'  bigfile

 

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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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