29.1.3 Modifiers
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.
ga- Cause changes to be applied over the entire event line. Used in
conjunction with `s', as in
gs/old/new/,
or with `&'.
G- Apply the following `s' modifier once to each word in the event.