Check file from multiple files is empty using awk Post: 302950924

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Top Forums Shell Programming and Scripting Check file from multiple files is empty using awk Post 302950924 by Don Cragun on Thursday 30th of July 2015 05:44:20 AM

07-30-2015

Registered User

If the filenames vary from run to run, you could try something like:

Code:

#!/bin/ksh
awk -F, '
FNR == 1 {
	for(filecounter = 1; filecounter <= ARGC; filecounter++)
		if(FILENAME == ARGV[filecounter])
			break
	printf("***Processing file %s, filecounter=%d\n", FILENAME, filecounter)
}
filecounter==1 {KRL[$1]=$2;next}
filecounter==2 {GUJ[$1]=$2;next}
filecounter==3 {DEL[$1]=$2;next}
filecounter==4 {UPW[$1]=$2;next}
{	if($1 in KRL)
		print "FOUND IN KRL"
	else if($1 in GUJ)
		print "FOUND IN GUJ"
	else if($1 in DEL)
		print "FOUND IN DEL"
	else if($1 in UPW)
		print "FOUND IN UPW"
	else	print "Not Found"
}' "$@"

and invoke this script with:

Code:

./scriptname File1 file2 file3 file4 mainfile

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

Note, however, that if you want to have parameters passed to your script as trailing arguments as in:

Code:

./scriptname OFS="," File1 file2 file3 file4 mainfile

you'd have to make the filename matching code more complex.

Or, you could leave out the FNR == 1 clause in your script and invoke it with:

Code:

./scriptname filecounter=1 File1 filecounter=2 file2 filecounter=3 file3 filecounter=4 file4 filecounter=5 mainfile

Don Cragun

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LEARN ABOUT REDHAT

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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