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Full Discussion: How to handle grepping variable data containing wildcards?
Top Forums Shell Programming and Scripting How to handle grepping variable data containing wildcards? Post 302983348 by abercrom on Monday 10th of October 2016 01:16:56 PM
Old 10-10-2016
How to handle grepping variable data containing wildcards?
I have a lot of files with keywords and unique names. I'm using a shell script to refer to a simple pattern file with comma separated values in order to match on certain keywords. The problem is that I don't understand how to handle the wildcard values when I want to skip over the unique names.

Here is an example of the data patterns in the files:

Code:
abcd efgh ijkl
abcd efgh ijkl
abcd mnop unique-name01 efgh ijkl
abcd mnop unique-name02 efgh ijkl
abcd efgh ijkl


An example of the pattern file:

Code:
abcd efgh ijkl,LABEL001 LABEL002
mnop .* efgh ijkl,LABEL001 LABEL003


The shell script operates like this:

Code:
while IFS= read -r fi
  fn=`awk -F, '{print $NF}'`
  fp=`awk -F, '{print $1}'`

  echo "Pattern: \"$fp\""
  egrep "$fp" $source_file

done < pattern_file


The result looks like this:

Code:
Pattern: "abcd efgh ijkl"

[matches]
Code:
Pattern: "abcd mnop . .. efgh ijkl"

[no matches]

I get correct matches on the patterns that do not use a wildcards, so I know the script is working in that respect.
The wildcard patterns do not work, and it looks like the wildcards themselves are getting mangled somehow. In this example, the pattern has changed from "abcd mnop .* efgh ijkl" to "abcd mnop . .. efgh ijkl"

Thanks
Last edited by Scrutinizer; 10-10-2016 at 02:20 PM.. Reason: additional code tags for data samples
 

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atf-sh

ATF-SH(1)						    BSD General Commands Manual 						 ATF-SH(1)

NAME

     atf-sh [-s shell] -- interpreter for shell-based test programs

SYNOPSIS

     atf-sh script

DESCRIPTION

     atf-sh is an interpreter that runs the test program given in script after loading the atf-sh(3) library.

     atf-sh is not a real interpreter though: it is just a wrapper around the system-wide shell defined by ATF_SHELL.  atf-sh executes the inter-
     preter, loads the atf-sh(3) library and then runs the script.  You must consider atf-sh to be a POSIX shell by default and thus should not
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ENVIRONMENT

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EXAMPLES

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	   #! /usr/bin/env atf-sh

     Alternatively, if you want to explicitly choose a shell interpreter, you cannot rely on env(1) to find atf-sh.  Instead, you have to hardcode
     the path to atf-sh in the script and then use the -s option afterwards as a single parameter:

	   #! /path/to/bin/atf-sh -s/bin/bash

ENVIRONMENT

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SEE ALSO

     atf-sh(3)

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