Manual Pages  — SYSRC

The following options are available:

-a
	Dump a list of all non-default configuration variables.
-A
	Dump a list of all configuration variables (incl. defaults).
-c
	Check only. For querying, return success if all requested variables are set (even if NULL), otherwise return error status. For assignments, return success if no changes are required, otherwise failure. If verbose (see "-v") prints a message stating whether variables are set and/or changes are required.
-d
	Print a description of the given variable.
-D
	Show default value(s) only (this is the same as setting RC_CONFS to NULL or passing `-f' with a NULL file-argument).
-e
	Print query results as sh(1) compatible syntax (for example,‘var=value’). Ignored if either ‘-n’ or ‘-F’ is specified.
-E
	When given '-l' or '-L' to list configuration files, only list those that exist. When changing a setting, prefer to modify existing files.
-f file
	Operate on the specified file(s) instead of the files obtained by reading the 'rc_conf_files' entry in the RC_DEFAULTS file. This option can be specified multiple times for additional files.
-F
	Show only the last rc.conf(5) file each directive is in.
-h
	Print a short usage message to stderr and exit.
--help
	Print a full usage statement to stderr and exit.
-i
	Ignore unknown variables.
-j jail
	The jid or name of the jail to operate within (overrides '-R dir '; requiresjexec(8)).
-l
	List configuration files used at startup on stdout and exit.
-L
	List all configuration files including rc.conf.d entries on stdout and exit. Can be combined with '-v' or '-e' to show service names. sysrc exits with success if all named services are installed, failure otherwise.
-n
	Show only variable values, not their names.
-N
	Show only variable names, not their values.
-q
	Quiet. Disable verbose and hide certain errors. When combined with '-L' and one or more name arguments, provide only exit status and no output.
-R dir
	Operate within the root directory 'dir' rather than '/'.
-s name
	If an rc.d script of name exists ( in "/etc/rc.d" or local_startup directories ), process its "rc.conf.d" entries as potential overrides to 'rc_conf_files'. See rc.subr(8) for additional information on "rc.conf.d". Can be combined with '-l' to list configuration files used by service at startup.
-v
	Verbose. Print the pathname of the specific rc.conf(5) file where the directive was found.
--version
	Print version information to stdout and exit.
-x
	Remove variable(s) from specified file(s).

This utility has a similar syntax to sysctl(8). It shares the `-e' and `-n' options (detailed above) and also has the same ‘name[=value]’ syntax for making queries/assignments. In addition (but unlikesysctl(8)), ‘name+=value’ is supported for adding items to values (see APPENDING VALUES) and ‘name-=value’ is supported for removing items from values (see SUBTRACTING VALUES).

However, while sysctl(8) serves to query/modify MIBs in the entrant kernel, sysrc instead works on values in the system rc.conf(5) configuration files.

The list of system configuration files is configured in the file ‘/etc/defaults/rc.conf’ within the variable ‘rc_conf_files’, which by-default contains a space-separated list of pathnames. On all FreeBSD systems, this defaults to the value "/etc/rc.conf /etc/rc.conf.local". Each pathname is sourced in-order upon startup. It is in the same fashion that sysrc sources the configuration files before returning the value of the given variable.

When supplied a variable name, sysrc will return the value of the variable. If the variable does not appear in any of the configured ‘rc_conf_files’, an error is printed and error status is returned.

When changing values of a given variable, it does not matter if the variable appears in any of the ‘rc_conf_files’ or not. If the variable does not appear in any of the files, it is appended to the end of the first pathname in the ‘rc_conf_files’ variable. Otherwise, sysrc will replace only the last-occurrence in the last-file found to contain the variable. This gets the value to take effect next boot without heavily modifying these integral files (yet taking care not to allow the file to grow unwieldy should sysrc be called repeatedly).

awk(1), cat(1), chmod(1), env(1), grep(1), mktemp(1), mv(1), rm(1), sh(1), stat(1), tail(1), chown(8), chroot(8), jls(8), and jexec(8).

sysrc sshd_enable

    returns the value of $sshd_enable, usually YES or NO.

sysrc defaultrouter

    returns IP address of default router (if configured).

Working on other files, such as crontab(5):

sysrc -f /etc/crontab MAILTO

    returns the value of the MAILTO setting (if configured).

Appending to existing values:

sysrc amp;cloned_interfaces+=gif0

    appends "gif0 "to $cloned_interfaces (see APPENDING VALUES).

sysrc amp;cloned_interfaces-=gif0

    removes "gif0 "from $cloned_interfaces (see SUBTRACTING VALUES).

In addition to the above syntax, sysrc also supports inline sh(1) PARAMETER expansion for changing the way values are reported, shown below:

sysrc amp;'hostname%%.*'

    returns $hostname up to (but not including) first `.'.

sysrc amp;'network_interfaces%%[$IFS]*'

    returns first word of $network_interfaces.

sysrc amp;'ntpdate_flags##*[$IFS]'

    returns last word of $ntpdate_flags (time server address).

sysrc usbd_flags-"default"

    returns $usbd_flags or default if unset or NULL.

sysrc cloned_interfaces+"alternate"

    returns alternate if $cloned_interfaces is set.