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You could try something like this, not they after finding a watch file you should probably delete or move it aside to stop actions repeating on every check:

function load_conf
{
POS=0
while...

What do a.sh, b.sh, c.sh, d.sh, e.sh do?

What should happen to the input file after the scripts complete?

These config files sound quite similar to makefiles, or could be made so.

I'm presuming by 'engine', he means 'program that uses regexes', not 'program that implements regexes'.

awk or perl would both be good languages for this.

Why do you want to re-invent the wheel? Perl has a very powerful regex engine. You may use Perl.

Init the input file:

$ cat infile
1,mnq,1
1,ddd,2
1,ddd,3
1,sss,4
1,ddd,5
1,add,6
1,fff,7
1,ddr,8
1,rrd,9
1,der,10
2,mnq,11
3,pqr,12
4,pqr,13
5,pqr,14
12,adhe,0
13,add,1

How come your file-in and file-out do not match?
Your sample file has five sample lines, but three of them do not show up in your output. But, there are many lines in the output that are not in the...

Well, fields 1 and 2 are preserved, save fields of each record out for interrogation with the next, and if last matches for 1 and 2, discard 3 and use old 3.