base arch linux installation doesn't include `hostname` binary as it's part of
a separate `inetutils` package, use systemd `hostnamectl` which is available in
all systemd-based distributions
When we're not being run by bash or zsh then we can't use
bashisms to test that we're bash or zsh.
Just use good old posix test syntax instead.
refs: #447
This commit provides a shell script that hooks into bash and zsh
to enable OSC 7 and semantic zones.
The packaging for Fedora and Debian deploys that script to
/etc/profile.d.
