HEAD (and GET and POST) are optional extras in libwww-perl; they are just aliases to the lwp-response script and aren't even built by default. head, on the other hand, is a fairly basic utility that should always be around, and all kinds of shell scripts can be expected to break if it isn't.
In reply to Re^3: what is /usr/bin/head
by ysth
in thread what is /usr/bin/head
by richill
| For: | Use: | ||
| & | & | ||
| < | < | ||
| > | > | ||
| [ | [ | ||
| ] | ] |