Bash/awk script problem Post: 302939776

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Top Forums Shell Programming and Scripting Bash/awk script problem Post 302939776 by Don Cragun on Saturday 28th of March 2015 09:14:09 PM

03-28-2015

Registered User

In addition to what sea and mjf have already noted, even if you do append the output of paste (rather than overwriting the output from paste) you still won't get what you want. The paste utility doesn't paste the input file onto the ends of lines it reads from the output file; it pastes lines from one or more input files to create lines in the output file.

You could run paste once for each each input file in turn to paste it at the ned of the appropriate output file into a temp file and move the temp file back to the appropriate output file. But running awk 100 times and running paste 100 times seems highly inefficient to me. I'd suggest something more like:

Code:

#!/bin/bash
rm -f  file2.dat file3.dat
awk '
BEGIN {	outf[1] = "file2"
	outf[0] = "file3"
}
function choose(infile) {
	if(ofc[of = (s / c) > .28]++ == 0)
		printf("paste \"%s\"", infile) > (outf[of] ".sh")
	else	printf(" \"%s\"", infile) >> (outf[of] ".sh")
	c = s = 0
}
FNR == 1{
	if(NR > 1)
		choose(fn)
	fn = FILENAME
}
{	c++
	s += $1
}
END {	choose(fn)
	for(i = 0; i <= 1; i++)
		if(ofc[i]) {
			printf(" > %s.dat\n", outf[i]) >> (outf[i] ".sh")
			printf("chmod +x %s.sh;./%s.sh;echo rm %s.sh\n",
				outf[i], outf[i], outf[i])
		}
}' file1_[1-9].dat file1_[1-9][0-9].dat file1_100.dat | bash

which runs awk once, paste once or twice, and chmod once or twice, and bash one extra time to run the commands produced by this awk script.

This code creates one or two temporary shell scripts to paste the appropriate input files together into your final output files, runs those scripts, and uses echo to remind you to remove those temporary shell scripts. If it does what you want; remove the echo in red in the awk script to actually remove the temporary scripts after that have been run.

If you want to try this on a Solaris/SunOS system, change awk to /usr/xpg4/bin/awk.

Don Cragun

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LEARN ABOUT V7

diff3

DIFF3(1)						      General Commands Manual							  DIFF3(1)

NAME

       diff3 - 3-way differential file comparison

SYNOPSIS

       diff3 [ -ex3 ] file1 file2 file3

DESCRIPTION

       Diff3 compares three versions of a file, and publishes disagreeing ranges of text flagged with these codes:

       ====	       all three files differ

       ====1	       file1 is different

       ====2	       file2 is different

       ====3	       file3 is different

       The type of change suffered in converting a given range of a given file to some other is indicated in one of these ways:

       f : n1 a        Text is to be appended after line number n1 in file f, where f = 1, 2, or 3.

       f : n1 , n2 c   Text is to be changed in the range line n1 to line n2.  If n1 = n2, the range may be abbreviated to n1.

       The original contents of the range follows immediately after a c indication.  When the contents of two files are identical, the contents of
       the lower-numbered file is suppressed.

       Under the -e option, diff3 publishes a script for the editor ed that will incorporate into file1 all changes between file2 and file3,  i.e.
       the  changes  that  normally  would  be	flagged ==== and ====3.  Option -x (-3) produces a script to incorporate only changes flagged ====
       (====3).  The following command will apply the resulting script to `file1'.

		(cat script; echo '1,$p') | ed - file1

FILES

       /tmp/d3?????
       /usr/lib/diff3

SEE ALSO

       diff(1)

BUGS

       Text lines that consist of a single `.' will defeat -e.
       Files longer than 64K bytes won't work.

																	  DIFF3(1)

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