sed feature request

[Eric Heitzman]

The GNU version of "sed" appears to lack the ability to edit files 
inline.  If I want to use sed to modify 100 files in a directory, there 
seems to be no way to modify the files in place.  Instead, I have to 
write a script which runs sed against a file, saves the output in a 
temporary file, and then copies the temporary over the original.  Then 
if I have a whole bunch of files in a directory, I would have to write 
another script to repeatedly call to use this "one file at a time" 
version of sed.  This seems silly, so I think I'm probably just missing 
something about how sed should be properly used.

The BSD version of said includes a -i switch which permits inline 
editing.  You can specify a file extension, which causes sed to write 
the output of each modified file out to a new file with the same name, 
with the additional extension appended.  If omit the extension, the 
source file is used as the target file.

Eric