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Full Discussion: Split files with formatted numbers
Top Forums Shell Programming and Scripting Split files with formatted numbers Post 302906564 by Don Cragun on Friday 20th of June 2014 04:41:11 PM
Old 06-20-2014
Since you're specifying 3 digit file sequence numbers, I assume you expect that you'll be producing more than a hundred files with this script. There is a good chance that awk will run out of file descriptors if you keep all of them open. You might want to consider something like:
Code:
awk '
NR%2 {	# Odd lines:
	fn = sprintf("split.%03d.txt", (NR - 1) / 2)
}
{	# all lines:
	print >> fn
}
(NR%2) == 0 {
	# Even lines:
	close(fn)
}' split.txt

If there are existing split.xxx.txt files when you start this script do you really want to append data to them, or do you want to remove any data that was there before and just keep what you find in the current input file?

If you want to append to existing files, the script above should work.

If you want to replace data instead of appending data, change:
Code:
	print >> fn

to:
Code:
	print > fn

As always, if you want to try this on a Solaris/SunOS system, change awk to /usr/xpg4/bin/awk, /usr/xpg6/bin/awk, or nawk.
This User Gave Thanks to Don Cragun For This Post:
bobbygsk
 

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LEARN ABOUT SUSE

igawk

IGAWK(1)							 Utility Commands							  IGAWK(1)

NAME

       igawk - gawk with include files

SYNOPSIS

       igawk [ all gawk options ] -f program-file [ -- ] file ...
       igawk [ all gawk options ] [ -- ] program-text file ...

DESCRIPTION

       Igawk is a simple shell script that adds the ability to have ``include files'' to gawk(1).

       AWK programs for igawk are the same as for gawk, except that, in addition, you may have lines like

	      @include getopt.awk

       in your program to include the file getopt.awk from either the current directory or one of the other directories in the search path.

OPTIONS

       See gawk(1) for a full description of the AWK language and the options that gawk supports.

EXAMPLES

       cat << EOF > test.awk
       @include getopt.awk

       BEGIN {
	    while (getopt(ARGC, ARGV, "am:q") != -1)
		 ...
       }
       EOF

       igawk -f test.awk

SEE ALSO

       gawk(1)

       Effective AWK Programming, Edition 1.0, published by the Free Software Foundation, 1995.

AUTHOR

       Arnold Robbins (arnold@skeeve.com).

Free Software Foundation					    Nov 3 1999								  IGAWK(1)
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