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Full Discussion: Split a file based on pattern in awk, grep, sed or perl
Top Forums Shell Programming and Scripting Split a file based on pattern in awk, grep, sed or perl Post 302207522 by drl on Friday 20th of June 2008 06:57:07 AM
Old 06-20-2008
Hi.

It is useful to know how to do custom splitting with awk, perl, etc., but one can often use utilities that are already present, such as csplit:
Code:
#!/bin/bash -

# @(#) s1       Demonstrate context splitting, csplit.

echo
echo "(Versions displayed with local utility \"version\")"
version >/dev/null 2>&1 && version =o $(_eat $0 $1) csplit
echo

FILE=${1-data1}

# Remove debris from previous run.

rm -f xx*

if uname -a | grep SunOS
then
  csplit -k $FILE '/^B/' '{99}'
else
  csplit -z $FILE '/^B/' '{*}'
fi

echo " Samples of output files:"
for file in xx*
do
  echo
  echo "-- $file --"
  head -2 $file
done

exit 0

Producing:
Code:
$ ./s1

(Versions displayed with local utility "version")
SunOS 5.10
GNU bash 3.00.16
csplit - no version provided for /usr/bin/csplit.

SunOS vm-solaris 5.10 Generic_120012-14 i86pc i386 i86pc
0
64
89
csplit: {99} - out of range
90
 Samples of output files:

-- xx00 --

-- xx01 --
Buuuu xxx bbb
Kmmmm rrr ssss uuuu

-- xx02 --
Bxxxx jjjj dddd
Kuuuu eeeee nnnn

-- xx03 --
Bffff mmmm iiiii
Ktttt eeeeeee

See man csplit for details (Solaris man page has some examples, unlike the man page in Linux) ... cheers, drl
 

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LEARN ABOUT REDHAT

csplit

CSPLIT(1)								FSF								 CSPLIT(1)

NAME

       csplit - split a file into sections determined by context lines

SYNOPSIS

       csplit [OPTION]... FILE PATTERN...

DESCRIPTION

       Output pieces of FILE separated by PATTERN(s) to files `xx01', `xx02', ..., and output byte counts of each piece to standard output.

       Mandatory arguments to long options are mandatory for short options too.

       -b, --suffix-format=FORMAT use sprintf FORMAT instead of %d

       -f, --prefix=PREFIX
	      use PREFIX instead of `xx'

       -k, --keep-files
	      do not remove output files on errors

       -n, --digits=DIGITS
	      use specified number of digits instead of 2

       -s, --quiet, --silent
	      do not print counts of output file sizes

       -z, --elide-empty-files
	      remove empty output files

       --help display this help and exit

       --version
	      output version information and exit

       Read standard input if FILE is -.  Each PATTERN may be:

       INTEGER
	      copy up to but not including specified line number

       /REGEXP/[OFFSET]
	      copy up to but not including a matching line

       %REGEXP%[OFFSET]
	      skip to, but not including a matching line

       {INTEGER}
	      repeat the previous pattern specified number of times

       {*}    repeat the previous pattern as many times as possible

       A line OFFSET is a required `+' or `-' followed by a positive integer.

AUTHOR

       Written by Stuart Kemp and David MacKenzie.

REPORTING BUGS

       Report bugs to <bug-coreutils@gnu.org>.

COPYRIGHT

       Copyright (C) 2002 Free Software Foundation, Inc.
       This is free software; see the source for copying conditions.  There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICU-
       LAR PURPOSE.

SEE ALSO

       The full documentation for csplit is maintained as a Texinfo manual.  If the info and csplit programs are properly installed at your  site,
       the command

	      info csplit

       should give you access to the complete manual.

csplit (coreutils) 4.5.3					   February 2003							 CSPLIT(1)
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