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Full Discussion: Check file from multiple files is empty using awk
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
Old 07-30-2015
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

 

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LEARN ABOUT OPENSOLARIS

setusershell

getusershell(3C)					   Standard C Library Functions 					  getusershell(3C)

NAME

       getusershell, setusershell, endusershell - get legal user shells

SYNOPSIS

       #include <unistd.h>

       char *getusershell(void);

       void setusershell(void);

       void endusershell(void);

DESCRIPTION

       The  getusershell()  function  returns  a  pointer  to  a  legal  user  shell  as defined by the system manager in the file /etc/shells. If
       /etc/shells does not exist, the following locations of the standard system shells are used in its place:

	 /bin/bash		    /bin/csh
	 /bin/jsh		    /bin/ksh
	 /bin/ksh93		    /bin/pfcsh
	 /bin/pfksh		    /bin/pfsh
	 /bin/sh		    /bin/tcsh
	 /bin/zsh		    /sbin/jsh
	 /sbin/pfsh		    /sbin/sh
	 /usr/bin/bash		    /usr/bin/csh
	 /usr/bin/jsh		    /usr/bin/ksh
	 /usr/bin/ksh93 	    /usr/bin/pfcsh
	 /usr/bin/pfksh 	    /usr/bin/pfsh
	 /usr/bin/sh		    /usr/bin/tcsh
	 /usr/bin/zsh		    /usr/sfw/bin/zsh
	 /usr/xpg4/bin/sh

       The getusershell() function opens the file /etc/shells, if it exists, and returns the next entry in the list of shells.

       The setusershell() function rewinds the file or the list.

       The endusershell() function closes the file, frees any memory used by getusershell() and setusershell(), and rewinds the file /etc/shells.

RETURN VALUES

       The getusershell() function returns a null pointer on EOF.

BUGS

       All information is contained in memory that may be freed with a call to endusershell(), so it must be copied if it is to be saved.

NOTES

       Restricted shells should not be listed in /etc/shells.

SunOS 5.11							    1 Nov 2007							  getusershell(3C)
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