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Manual Pages  — SYSCTL.CONF

NAME

sysctl.conf – kernel state defaults

CONTENTS

DESCRIPTION

The /etc/sysctl.conf file is read in when the system goes into multi-user mode to set default settings for the kernel. The /etc/sysctl.conf is in the format of the sysctl(8) command, i.e.
sysctl_mib=value

Comments are denoted by a "#" at the beginning of a line. Comments can also exist at the end of a line, as seen in the EXAMPLES section, below.

FILES

/etc/sysctl.conf
  Initial settings for sysctl(8).

EXAMPLES

To turn off logging of programs that exit due to fatal signals you may use a configuration like
# Configure logging.
kern.logsigexit=0       # Do not log fatal signal exits (e.g. sig 11)

SEE ALSO

rc.conf(5), rc(8), sysctl(8)

HISTORY

The sysctl.conf file appeared in FreeBSD 4.0 .

BUGS

If loadable kernel modules are used to introduce additional kernel functionality and sysctls to manage that functionality, sysctl.conf may be processed too early in the boot process to set those sysctls. For example, sysctls to manage the linux emulator cannot be set in sysctl.conf if the linux emulator is loaded as a module rather than compiled into the kernel.

SYSCTL.CONF (5) December 30, 1999

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Please direct any comments about this manual page service to Ben Bullock.

Like a classics radio station whose play list spans decades, Unix simultaneously exhibits its mixed and dated heritage. There's Clash-era graphics interfaces; Beatles-era two-letter command names; and systems programs (for example, ps) whose terse and obscure output was designed for slow teletypes; Bing Crosby-era command editing (# and @ are still the default line editing commands), and Scott Joplin-era core dumps.
— The Unix Haters' handbook