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Ok, I've figured out a solution that mostly works, however I can't get it to work when passing an argument into the sed regular expression. I basically have this for extracting any line for a file...

Thanks! That helps, although I'm seeing other complications here. For one, I won't know what I'm searching for since this will come as input in from other files (catA_list, catB_list, catC_list). ...

I'm trying to figure out how to do this efficiently with as little execution time as possible and I'm pretty sure using sed is the best way. However I'm new to sed and all the reading and examples...