Update or modify iRules using command line or bash scripts

I'm new to iRules and F5 technologies -

I needed to update/modify several (100s) iRules on multiple F5s. It's like find and replace specific text on iRules.

What is the best way to approach this change? I found a way to export each and every iRules to files and replace specific text as well. Is there a command line utility to update the iRule using from file or any other way?

Any suggestions are appreciated.