Item Keyword	Description
core	limits the core file size (KB)
data	max data size (KB)
fsize	maximum filesize (KB)
memlock	max locked-in-memory address space (KB)
nofile	max number of open file descriptors
rss	max resident set size (KB)
stack	max stack size (KB)
cpu	max CPU time (MIN)
nproc	max number of processes
as	address space limit (KB)
maxlogins	max number of logins for this user
maxsyslogins	max number of logins on the system
priority	the priority to run user process with
locks	max number of file locks the user can hold
sigpending	max number of pending signals
msgqueue	– max memory used by POSIX message queues (bytes)
nice	max nice priority allowed to raise to values: [-20, 19]
rtprio	max realtime priority
chroot	change root to directory (Debian-specific)