If you want to play it safe and list all security types, you can use alternation to list them all (see perlre and perlretut:

perl -p -i.bak -e 's/(CUSIP|CUSIQ|something else)Y/${1}H'

[download]

In reply to Re^3: One liner to S & R by column by Corion
in thread One liner to S & R by column by dirtdog

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