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Full Discussion: Add a column to a file
Top Forums UNIX for Dummies Questions & Answers Add a column to a file Post 302940883 by Don Cragun on Thursday 9th of April 2015 03:17:17 PM
Old 04-09-2015
In the script:
Code:
#!/bin/ksh

DAY=`date +%y%m%d`
H=`date +%H`
D=`date +%d`
cat d1 | while read line
do
a=$(echo $line | awk '{print $1}')
n=$(echo $line | awk '{print $2}')
awk '{print $0, $n}' d1 >> d2
done

What are the variables DAY, H, D, and a intended to be used for?

Shell variables are not available inside an awk script unless you explicitly set an awk variable to the value of that shell variable when you invoke awk.

Why use:
Code:
cat d1 | while read line
do
a=$(echo $line | awk '{print $1}')
n=$(echo $line | awk '{print $2}')
...
done

instead of just using:
Code:
while read a n
do
        ...
done < d1

which doesn't need to invoke awk twice for each input line and cat, but produces exactly the same results?

Would something like this do what you're trying to do?:
Code:
#!/bin/ksh
awk '
BEGIN {	OFS = "\t"
}
{	l[NR] = $0
	f[NR] = $NF
}
END {	for(i = 1; i <= NR; i++)
		for(j = 1; j <= NR; j++)
			print l[j], f[i]
}' d1

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

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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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