Get Linux Information

sysctl - configure kernel parameters at runtime
-a Display all values currently available.
-A Display all values currently available in table form.

getconf - get configuration values

help: help [-s] [pattern ...]
Display helpful information about builtin commands. If PATTERN is
specified, gives detailed help on all commands matching PATTERN,
otherwise a list of the builtins is printed. The -s option
restricts the output for each builtin command matching PATTERN to
a short usage synopsis.

# ulimit
unlimited

# umask
0022