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Full Discussion: Grepping for one variable while using awk to parse an associated variable
Top Forums UNIX for Beginners Questions & Answers Grepping for one variable while using awk to parse an associated variable Post 303042701 by ncwxpanther on Friday 3rd of January 2020 04:08:54 PM
Old 01-03-2020
Grepping for one variable while using awk to parse an associated variable
Im trying to search for a single variable in the first field and from that output use awk to extract out the lines that contain a value less than a value stored in another variable. Both the variables are associated with each other.

Any guidance is appreciated.

File that contains the variables
variables.txt

Code:
01001 63.9
01003 66.8
01005 64.8
01007 62.8

file-to-search.txt

Code:
01001 02  1900 65.6
01001 02  1901 60.6
01001 02  1902 62.6
....
01003  02  1900 65.1
01003  02  1901 65.3
01003  02  1902 67.3
....
01005  02  1900 64.7
01005  02  1901 65.2
01005  02  1902 65.2
...
01007  02  1900 64.8
01007  02  1901 63.8
01007  02  1902 62.7
....

I was using a for loop but realized that the resulting output was not correct.
Code:
county=$(awk '{ print $1 }' variables.txt)
val=$(awk '{ print $2 }' variables.txt)

for id in $county
do
grep "$id" file-to-search.txt | awk '$4 < $val { print $0 }' | tail -1 | awk '{print $1" " $3" " $4}'
done

What im hoping for is a file that looks like this
Code:
01001 1902 62.6
01003 1901 65.3
01005 1900 64.7
01007 1902 62.7

 

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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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