Re: searching for multiple lines from outfile and printing them all in the final outfile

OP and OP's additional notes suggest that the objective is a multi-level or "tiered" selection of data.

Select from among many inputs to one "output file"
Then sub-select lines from "output file" to a "final output file."

The problem then, is the OP's non-specification of the criteria by which one discards some lines from the "output file" and/or selects others for inclusion in the "final output file."

If this is indeed what you intend, Annonymonk, please let us know. Is the basis for subselection to be

Every third line
random selection
Some criterion susceptible to use of a regex
other?

Comment on Re: searching for multiple lines from outfile and printing them all in the final outfile

Replies are listed 'Best First'.
Re^2: searching for multiple lines from outfile and printing them all in the final outfile by Anonymous Monk on May 18, 2009 at 19:29 UTC
it is sub-select lines from "output file" to a "final output file." and random selction from output file. am I clear or please let me know if you need mroe information. Thanks a lot.	[reply]
Re^3: searching for multiple lines from outfile and printing them all in the final outfile by ww (Archbishop) on May 19, 2009 at 12:44 UTC
Assumes @output is populated from your source; prints to console: `for (0..9) { print $output[rand($#output)] . "\n"; }` [download] Printing to your `final_output.txt` file is left as an exercise for the student (since you've already solved that). This is likely to select duplicate_lines to your final file, which is still permitted by your spec (but which -- I think -- is not actually your intent). Search the Monastery for `unique` or `@seen` and similar for the many solutions to avoiding duplication. There is not need to create an `output` file (thereby eating cycles and disk space); do your initial selection from the source to an array `@output`.	[reply] [d/l] [select]