After the optional word designator, you can add a sequence of one or more
of the following modifiers, each preceded by a ‘:’.
Remove a trailing pathname component, leaving only the head.
Remove all leading pathname components, leaving the tail.
Remove a trailing suffix of the form ‘.suffix’, leaving
Remove all but the trailing suffix.
Print the new command but do not execute it.
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.
Cause changes to be applied over the entire event line. Used in
conjunction with ‘s’, as in gs/old/new/,
or with ‘&’.
Apply the following ‘s’ modifier once to each word in the event.