head & tail usage

[fnadeau]

While browsing the codebase and noticed that only head and tail use [FLAG] in their usage strings, whereas most other utilities use [OPTION] or [OPTIONS].

Is there a reason for this distinction? Is [FLAG] meant to convey something different semantically, or is this just a historical inconsistency?

Command used:
grep -r --include='en-US.ftl' '\-usage = ' | grep -oe '\[[A-Z]*\]' | sort | uniq -c