awk problems - awk ignores conditions Post: 302881309

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Top Forums Shell Programming and Scripting awk problems - awk ignores conditions Post 302881309 by SkySmart on Friday 27th of December 2013 07:40:19 PM

12-27-2013

Registered User

Quote:

Originally Posted by Don Cragun

Code:

 awk 'BEGIN{
       if('"$CURRENTSTATE"'<'"${WARNING}"')
               printf ("%s", "'"`MyOKFunc "" ; break`"'")
       else if (('"${CURRENTSTATE}"'>='"${WARNING}"') && ('"${CURRENTSTATE}"'<'"${CRITICAL}"'))
               printf ("%s", "'"`MyWARNFunc ""; break`"'")
       else if ('"${CURRENTSTATE}"'>='"${CRITICAL}"')
               printf ("%s", "'"`MyCRITFunc "" ; break`"'")
       else
               printf ("%s", "'"`MyUNKFunc "" ; break`"'")
'

If you thought that awk was going to perform the shell command substitutions when the awk printf statements are executed, you are wrong. The shell has to perform all four of those command substitutions to put together the parameters that will be passed to awk as the program awk is to evaluate. Furthermore, the shell break statements in all four of those command substitutions produce undefined results; break only has defined meaning inside a shell for, while, or until loop. If you are including this awk statement in the middle of a shell for, while, or until loop and hoping that the breaks in the command substitutions in the awk printf arguments will break out of that shell loop; that won't happen either. And, if that isn't enough, you don't have a valid awk program even if the command substitutions yielded syntactically correct awk printf statements; there is no closing '}' to match the '{' at the start of your awk BEGIN clause.

Even if you had a valid awk program and had valid command substitutions, assuming that the shell variables CRITICAL, CURRENTSTATE, and WARNING have been assigned integral values, it would be thousands of times faster (and MUCH easier to read and understand) if you would write this using shell if statements rather than invoking awk so you can use awk's < and >= operators (instead of using test's -lt and -ge primaries) and awk's more relaxed spacing requirements.

thank you. the shell if statements dont handle numbers like this "73.39", which is why i decided to use awk. its either awk or perl. and i personally dont like perl.

i'll retry with the closing brackets. dont know how i missed that. and by the way, yes, i am including this in a while loop. the original awk program i wrote didnt' have the breaks in it. but since it look like awk was running all four conditions instead of just one, i decided to put the break in there to try to force it break out of the first condition it matches.

SkySmart

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LEARN ABOUT OPENSOLARIS

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).

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +--------------------+-----------------+
       |  ATTRIBUTE TYPE    | ATTRIBUTE VALUE |
       +--------------------+-----------------+
       |Availability	    | SUNWgawk	      |
       +--------------------+-----------------+
       |Interface Stability | Volatile	      |
       +--------------------+-----------------+
NOTES

       Source for gawk is available on http://opensolaris.org.

Free Software Foundation					    Nov 3 1999								  IGAWK(1)

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