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After the optional word designator, you can add a sequence of one or more
of the following modifiers, each preceded by a `:'.
- h
- 
Remove a trailing pathname component, leaving only the head.
- t
- 
Remove all leading  pathname  components, leaving the tail.
- r
- 
Remove a trailing suffix of the form `.suffix', leaving
the basename.
- e
- 
Remove all but the trailing suffix.
- p
- 
Print the new command but do not execute it.
- s/old/new/
- 
Substitute new for the first occurrence of old in the
event line.  Any delimiter may be used in place of `/'.
The delimiter may be quoted in old and new
with a single backslash.  If `&' appears in new,
it is replaced by old.  A single backslash will quote
the `&'.  The final delimiter is optional if it is the last
character on the input line.
- &
- 
Repeat the previous substitution.
- g
- 
Cause changes to be applied over the entire event line.  Used in
conjunction with `s', as in gs/old/new/,
or with `&'.
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