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Full Discussion: field substitution w/awk
Top Forums Shell Programming and Scripting field substitution w/awk Post 37236 by Jimbo on Saturday 14th of June 2003 04:00:12 PM
Old 06-14-2003
That's not bad, actually - just a couple of issues ...
Code:
awk '{
if (substr($1, 1, 1) != "T" )
print
else
print substr ($1, 1, 14) '\"${proc_dt}\"' substr ($1, 24)
}' infile > newfile

Your code terminates with two rightbrace-quotemarks, so it hangs waiting on stdin because it does not see infile beyond that second quote.

There are several ways to get a variable into awk. The approach you used by allowing it to be substituted when the command line is parsed is a good way. However, when awk sees the unprotected 14-JUN-2003, that is evaluated as a numeric expression. JUN, as an undefined variable, evaluates to zero, so that makes 14-0-2003 = -1989. You want awk to see that as a string constant. So I surrounded it with double quotes and protected with backslashes so they don't get removed by the shell.

And a small point: When you want the tail-end of a word, such as beginning with character 24 for the remainder of that word, you can just say substr($1,24). With no third operand, it takes the remainder of the expression being substringed.
 

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LEARN ABOUT CENTOS

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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