I was personally puzzled at what $^T is for a moment, though I knew about $^I. So the simple form would be
mkdir bak/ ; perl -pi'bak/*' -e 's/foo/bar/g' file1 file2 file3 ...
Or
perl -pi'bak/*' -e 'BEGIN { mkdir($^I =~ m!(.*/)!) } s/foo/bar/g' file
+1 file2 file3 ...
Or maybe even
perl -MFile::Path -pi'bak/*' -e 'BEGIN { mkpath [ $^I =~ m!(.*/)! ] }
+s/foo/bar/g' file1 file2 file3 ...
*grin*
Makeshifts last the longest.
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