e() { echo "$*"; "$@"; }
# scripts that would interfere with unmounting /a, put them elsewhere
-e install mount-latest-subvol check-subvol-stale /usr/local/bin
+e install /a/bin/log-quiet/log-once switch-mail-host btrbk-run mount-latest-subvol check-subvol-stale /usr/local/bin