setquota
Reading the systemPackage: quota
Sets an account's or a group's disk quotas on a filesystem mounted with the quota options. Without those mount options the command succeeds and limits nothing.
What its options do in the lessons
From the same glossary the lessons render under their commands, so the two cannot disagree.
setquota -u- Applies the limit to a user rather than a group. The four numbers after the name are, in order: soft blocks, hard blocks, soft inodes, hard inodes — and a
0means “no limit”. setquota -a- Applies the setting to every filesystem listed in
/etc/mtabwith quotas turned on, rather than to one named mount point. setquota -T- Sets that user's grace period — how long they may exceed the soft limit before it starts behaving like the hard one. Both values are in seconds: blocks, then inodes.
Lessons that teach it
No lesson names it among its useful commands; it appears inside other lessons' command lines.