Deleting data from SSD in single-user mode

[ArmouredBear]

My 2011 iMac has a dead GPU but everything else is fine and it has 20GB RAM, 1GB SSD etc. so I'd like to sell it on to someone for spares or whatever. Obviously I'd like to delete my data but can only use Unix in single-user mode and mount the disk.

Is it enough to just delete using rm -r everything below /Users ???

 

[ArmouredBear]

Looks like rm -PR man do the trick.