"Do all your 25 filenames start pm_1206312_in and if not what are they like ?"

I think poj's original question was intended to provoke thought. If the glob pattern you're using is  'pm_1206312_in*' no file with a pattern  '4_os_*.txt' will be matched. Please see the documentation for glob and links therefrom for information on constructing glob filename patterns.

Give a man a fish:  <%-{-{-{-<

In reply to Re^7: find common data in multiple files by AnomalousMonk
in thread find common data in multiple files by mao9856

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