Use this option to ignore errors about unknown keys.
-w, --write var[=value]
Use this option when all arguments prescribe a key to be set.
-p [FILE], --load[=FILE]
Load in sysctl settings from the file specified or etc>sysctl.conf if none given. Specifying as filename means reading data from standard input.
Using this option will mean arguments to sysctl are files, which are read in the order they are specified. The file argument may be specified as regular expression.
-r, --pattern pattern
Only apply settings that match pattern.
The pattern uses extended regular expression syntax.