ing       maximum number of pending signals
 -l, --memlock          maximum size a process may lock into memory
 -m, --rss              maximum resident set size
 -n, --nofile           maximum number of open files
 -q, --msgqueue         maximum bytes in POSIX message queues
 -r, --rtprio           maximum real-time scheduling priority
 -s, --stack            maximum stack size
 -t, --cpu              maximum amount of CPU time in seconds
 -u, --nproc            maximum number of user processes
 -v, --as               size of virtual memory
 -x, --locks            maximum number of file locks
 -y, --rttime           CPU time in microseconds a process scheduled
                        under real-time scheduling