p4raw-id: //depot/perl@23160
$ perl -pi~ -e 's/foo/bar/' file1 file2 file3...
Note that because B<-i> renames or deletes the original file before
-creating a new file of the same name, UNIX-style hard links will not be
-preserved.
+creating a new file of the same name, UNIX-style soft and hard links will
+not be preserved.
Finally, the B<-i> switch does not impede execution when no
files are given on the command line. In this case, no backup is made