Things like "find", "grep" and "awk" are utilities, not scripting features - awk is an entire scripting language in itself.

If you want to use these in KiXtart, download the windows compiled versions - you'll find a couple of repositories on SourceForge. If you have trouble finding them, post again in the general forum and I'll look up the link for you.

It is not appropriate to build these into KiXtart. If you were using these utilites in *nix, you would be calling them in a shell (batch) script the same way that you use "SHELL" or one of the "pipe" UDFs in KiXtart.

What would be appropriate and would resolve most of your requests would be a request for:
1) Reading application output and writing directly to application input (piping).
2) Built-in support for regular expression matching.

While it would be nice to have KiXtart friendly built-in function these requirements can already be satisfied, albeit with a little work and/or the use of existing UDFs.
Search for WSHPipe for piping and Howard Bullocks efforts for regular expressions.