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    <p>Here is a version that <em>might</em> work (haven't tested it). Here is what I used to test it.</p> <p>Creating the test environment:</p> <pre><code>mkdir out mkdir archive echo -e "one\ttwo\tthree\tfour\none\t---\tthree\tfour" &gt; test.ext echo -e "newone\tnewtwo\tnewthree\tfour" &gt; archive/test.arc rm out/test.ext </code></pre> <p>The following script works.</p> <pre><code>#!/bin/bash mylist="test.ext" path_archive="./archive/" path_out="./out/" process_line () { line=$1 name=$2 set -- $line if [ "$2" == "---" ] ; then ID=$(grep -F -w "$4" ${path_archive}/${name}.arc | awk '{print $2}') echo -e "$1\t$ID\t$3\t$4" else echo "$line" fi } # process the files in the list for fname in `cat $mylist` ; do echo processing $fname name=`basename $fname .ext` cat $fname | while read line ; do process_line "$line" "$name" &gt;&gt; $path_out/$name.ext done done </code></pre> <p>The <code>set -- $line</code> is a bash thing. This sets the positional parameters (<code>$1</code>, <code>$2</code>, ...) to whatever arguments were provided to <code>set --</code>. With no arguments, <code>set --</code> unsets the positional parameters. Consider the following example:</p> <pre><code>:~$ echo $1 :~$ set -- foo :-$ echo $1 foo :-$ set -- bar :-$ echo $1 bar </code></pre> <p>The above <code>for fname in `cat $mylist`; do</code> will not work if file names in <code>$mylist</code> contain spaces. If that is the case and there is exactly one file name in each line, you should do <code>cat $mylist | while read fname ; do</code> instead and make sure that <code>$fname</code> is always in double quotes (<code>"$fname"</code>).</p> <p>Output:</p> <pre><code>$ cat test.ext one two three four one --- three four $ cat out/test.ext one two three four one newtwo three four </code></pre> <p>All in all, I would rather use Perl or Python for a task like that. It will be much easier to write and debug.</p>
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    1. COUse '==' to compare strings.
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    2. COThank you @January, it's not working still (same IDXXX command not found error) am going to keep searching and playing to fix this, or start again. I have tried with both eq and ==
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    3. COAlso I have tried to describe the ID=$ line in original post.
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