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In case anyone was wondering, the final all singing all dancing command (having set the old string to $old and the new string to $new) is:

find . -name "*$old*" -print|awk -v n=$new -v o=$old...

Hmmm, answered my own question eventually, this line does it (for replacing 2000 with 1500):

find . -name "*2000*" -print|awk '{f=$0;gsub("2000","1500");print "sed -e 's/2000/1500/g' "f" >...

Hi,
I have a set of files stored in a single directory that I use to set parameters for a physics code, and I would like to streamline the process of updating them all when I change a parameter....