I have something like 50K *.ps (PostScript) files, these are basically billing files generated from data center. Now we want to read and select files based on some aspects like
1. Billed amount greater then (say) INR 2000
2. Billing address or Pincode matches a given value

I know this can be achieved by awk and sed, the problem begins here, I Don't know how to do it, also I am almost a newbe when it comes to shell scripting, so can somebody help me in writing a script whereby I can read the files, get their filename and then pass on to printer (with lpr) to print the files.

Also, if their is already a solution to these on Linux or Windows platform, then please suggest the software also.

If (like me) you're unfamiliar with awk/sed why not run ps2ascii on them, which should give you 50k text files. Then, use grep/egrep on the text files? ps2ascii comes with a few other utilities as part of ghostscript.

There are many bash scripting tutorials you can find with a brief Google search. The ones on tldp are excellent, so start there. We can HELP you, so post what YOU have written/tried so far. But after using Linux for 8 years now, you should have some ideas.

loop through the files, and grep for a pattern. If you find it, run a command. Simple logic, and there are many example scripts you can find.