If you want to run Perforce with p4dctl since it’s so handy, but you only have a license for some older version of Perforce, here’s how you can have p4dctl point at that version:
Put the p4d binary into /opt/perforce/sbin/ and name it something descriptive for its version, like “p4d.2012.1”
Change the symbolic link in /etc/alternatives/helix-p4d to point at that instead of the p4d version that installed:
ln -s /opt/perforce/sbin/p4d.2012.1 /etc/alternatives/helix-p4d
Done. You’ve just swapped out the version of p4d that p4dctl uses. But, this is global for the entire machine, so it’s something to consider. I think it’ll auto-upgrade an existing p4 instance, but it can’t go backwards to lder versions, just to mention that. You’ll get weird errors.