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.

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LEARN ABOUT DEBIAN

dpkg-awk

DPKG-AWK(1)						      General Commands Manual						       DPKG-AWK(1)

NAME

       dpkg-awk - Utility to read a dpkg style db file

SYNOPSIS

       dpkg-awk [(-f|--file) filename] [(-d|--debug) ##] [(-s|--sort) list] [(-rs|--rec_sep) ??] '<fieldname>:<regex>' ... -- <out_fieldname> ..

DESCRIPTION

       dpkg-awk  Parses  a  dpkg status file (or other similarly formatted file) and outputs the resulting records.  It can use regex on the field
       values to limit the returned records, it can also be told which fields to output, and it can sort the matched fields.

OPTIONS

       -f filename
       --file filename
	      The file to parse.  The default is /var/lib/dpkg/status.

       -d [#]
       --debug [#]
	      Each time this is specified, it increased the debug level.

       -s field(s)
       --sort field(s)
	      A space or comma separated list of fields to sort on.

       -n field(s)
       --numeric field(s)
	      A space or comma separated list of fields that should be interpreted as numeric in value.

       -rs ??
       --rec_sep ??
	      Output this string at the end of each output paragraph.

       -h
       --help Display some help.

       fieldname
	      The fields from the file, that are matched with the regex given.	The fieldnames are case insensitive.

       out_fieldname
	      The fields from the file, that are output for each record.  If the first field listed begins with ^, then the list  of  fields  that
	      follows will NOT be output.

BUGS

       Be  warned  that  the author has only a shallow understanding of the dpkg packaging system, so there are probably tons of bugs in this pro-
       gram.

       This program comes with no warranties.  If running this program causes fire and brimstone to rain down upon the earth, you will be on  your
       own.

       This program accesses the dpkg database directly in places, querying for data that cannot be gotten via dpkg.

AUTHOR

       Adam Heath <doogie@debian.org>

DEBIAN
								 Debian Utilities						       DPKG-AWK(1)

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