I see, thank you. The script is now working as desired after fixing the usage of substr, using next and the addition of seek(IN,0,0). Is there a more efficient way to accomplish this or is this an unavoidable consequence of the way the script is structured/written? My thought was that i'd only need to iterate over IN once as it's sorted and that once $F[0] no longer equalled the current key, it would begin reading IN where it left off for the next sequence before it terminated.

In reply to Re^4: Replacing substrings within hash values by K_Edw
in thread Replacing substrings within hash values by K_Edw

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