• Use the lsof (list open files) command to print a list of all open files. Highly useful tool; very flexible parameters. Similar in scope to find command, but for processes. List can be sorted/filtered as needed.

 Detail:
 ps ux | grep userID
 or Summary:
 ps ux | grep userID | wc -l

lsof | grep processId | wc -l
or
lsof | grep processName | wc -l

At a command prompt, type:

ulimit -n

At a command prompt, type:

ulimit -n 4096

cat /proc/sys/fs/file-max