SYSCTL.CONF(5) File Formats Manual SYSCTL.CONF(5) (NAME) sysctl.conf - (DESCRIPTION) sysctl.conf sysctl(8) . procps sysctl . systemd-sysctl(8) sysctl.d(5) /etc/sysctl.conf . (Configuration Format) procps sysctl : token = value () value . "#" ";" . "-" . (FILES) procps sysctl --system : /etc/sysctl.d/*.conf /run/sysctl.d/*.conf /usr/local/lib/sysctl.d/*.conf /usr/lib/sysctl.d/*.conf /lib/sysctl.d/*.conf procps sysctl /etc/sysctl.conf . systemd-sysctl sysctl . (BUGS) value /proc . (EXAMPLES) # # kernel.domainname = example.com ; A value containing a space is written to the sysctl. kernel.modprobe = /sbin/mod probe # A list of items for the value net.ipv4.ip_local_reserved_ports=8080,9148 (SEE ALSO) sysctl.d(5), sysctl(8), systemd-sysctl(8) (AUTHOR) sysctl Jim Warner < james.warner@comcast.net > Craig Small < csmall@dropbear.xyz > Sami Kerola < kerolasa@iki.fi > George Staikos < staikos@0wned.org > . procps-ng 2025-05-29 SYSCTL.CONF(5)