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Thank you for the advice. I guess I don't have bzgrep installed. I tried using zgrep, but that is actually slower than bzcat piped to grep.

The latter is definitely much faster than my...

I have a large number (50,000) of pretty large compressed files and I need only certain lines of data from them (each relevant line contains a certain key word). Each file contains 300 such lines. ...

Thank you very much! It is much appreciated.

Hello Everyone,

I have to subsample a large text file - 17,021,811 lines. I need to keep every other block of 290 lines (keep first 290 lines, throw away the next 290, keep the next 290, etc.)
...