On 07/27/2012 04:57 PM, Robert Xu wrote: The issue you will have to look out for is those cases where it is just Qt or TQt instead of Qt3, TQt3 (or whatever follows Q* and TQ*) In the stuff I have done I find that some of the header checks still require the Q or TQ such that a global change won't work (especially in the configure.py files). So keep a close eye on what all is getting changed. As for the sed command, let's just build one starting with: sed -i 's|Qt|TQt|g' filename (or *.whatever) Then further tailor it with any further REGEX, lookahead/back and remembered patters needed for the general file. Like when you are dealing with QT_VERSION or QT_LICENSE and you only want those to go to TQT and no other Q* changes, then: sed -i 's|QT_\([VL]\)|TQT_\1|g' filename (or *.whatever) Hopefully somebody else has more of a 'one size fits all' sed expression for this, but I've always had to just look at what I was dealing with and then come up with an expression that fit the bill. It might take 2 or 3 incremental sed calls to get everything done. -- David C. Rankin, J.D.,P.E.