1. Disk Space
df, du
Linux Check Disk Space Command To View System Disk Usage (df and du) | blog.imm.cnr.it
==> df should not be used on a machine with large disk space and multiple users; the response time would be prohibitively long.
====> use du on your sub-division
2. Memory
5 commands to check memory usage on Linux - BinaryTides
free -m
cat /proc/meminfo || vmstat -s
==> for user specific limits use ulimit
memory - How to create a user with limited RAM usage? - Unix & Linux Stack Exchange