Print the value of one or more resource limits or, if n is specified, set a resource limit to n. Resource limits can be either hard (-H) or soft (-S). By default, ulimit sets both limits or prints the soft limit. The options determine which resource is acted on. Values are in 1024-byte increments unless otherwise indicated.
Consider all subsequent strings to be arguments, not options.
Print all current limits.
Hard resource limit.
Soft resource limit.
These options limit specific resource sizes.
Size of processes' data segments.
Size of shell-created files.
Size of memory that the process can lock.
Resident set size.
Number of file descriptors. On many systems, this can't be set.
Pipe size, measured in blocks of 512 bytes.
Amount of CPU time, counted in seconds.
Number of processes per user.
Virtual memory used by shell.