sysctl – configure kernel parameters at runtime 


sysctl [-n] [-e] variable …
sysctl [-n] [-e] -w variable=value …
sysctl [-n] [-e] -p <filename> (default /etc/sysctl.conf)
sysctl [-n] [-e] -a
sysctl [-n] [-e] -A 

sysctl is used to modify kernel parameters at runtime


Use this option to disable printing of the key name when printing values.
Use this option to ignore errors about unknown keys.
Use this option when you want to change a sysctl setting.
Load in sysctl settings from the file specified or /etc/sysctl.conf if none given.
Display all values currently available.
Display all values currently available in table form.

/sbin/sysctl -a
/sbin/sysctl -n kernel.hostname
/sbin/sysctl -w kernel.domainname=””
/sbin/sysctl -p /etc/sysctl.conf