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  1. or download this
    mkdir bak/ ; perl -pi'bak/*' -e 's/foo/bar/g' file1 file2 file3 ...
  2. or download this
    perl -pi'bak/*' -e 'BEGIN { mkdir($^I =~ m!(.*/)!) } s/foo/bar/g' file
+1 file2 file3 ...
  3. or download this
    perl -MFile::Path -pi'bak/*' -e 'BEGIN { mkpath [ $^I =~ m!(.*/)! ] } 
+s/foo/bar/g' file1 file2 file3 ...