Does awk have parameter substitution? Post: 302942755

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Top Forums Shell Programming and Scripting Does awk have parameter substitution? Post 302942755 by Don Cragun on Friday 1st of May 2015 03:30:42 AM

05-01-2015

Registered User

Quote:

Originally Posted by Michael Stora

I thought the meaning of $1 was pretty unambiguous in AWK.

Here is a little more context:

Code:

 
while (getline < "'"$failListFile"'") { split( $0, a, ","); failMessage[a[1]a[2]a[3]a[4]a[5]]=a[8]
fs=a[6]; sub ( "^$", "0000 01 01 00 00 00", fs ); failStart[a[1]a[2]a[3]a[4]a[5]]=fs
fe=a[7]; sub ( "^$", "9999 12 31 23 59 59", fe ); failEnd[a[1]a[2]a[3]a[4]a[5]]=fe

Trying to do the assignment and default in a single command if possible (possibly analagous to parameter substitution in BASH, if such a thing exists in AWK).

Mike

There is no invocation of awk in this script. There is a reference to a shell variable failListFile (or maybe it is a reference to the current line in awk since the undefined awk variable failListFile with a $ in front of it references the contents of the current input line). There are mismatched braces. There is no description of what you are trying to do with this awk and/or bash script. I have no idea what "assignment and default in a single command" you are trying to perform.

I have shown you (in a working shell script that invokes awk) how you can assign an awk variable in an awk script based on a variable left uninitialized by the shell, a variable initialized to an empty string by the shell, and a variable initialized to a non-empty string by the shell and use that inside an awk script to set an awk variable to a default value based on a couple of different conditions.

You haven't explained what you want to do that isn't being done by the sample script I showed you. Since I can't figure out what you're trying to do, I am afraid that I am unable to help you any further.

Don Cragun

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LEARN ABOUT LINUX

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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