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32 .Nd safely edit system rc files
37 .Op Fl j Ar jail | Fl R Ar dir
38 .Ar name Ns Op = Ns Ar value
43 .Op Fl j Ar jail | Fl R Ar dir
50 variables from the collection of system rc files and allows processes with
51 appropriate privilege to change values in a safe and effective manner.
53 The following options are available:
54 .Bl -tag -width indent+
56 Dump a list of all non-default configuration variables.
58 Dump a list of all configuration variables
61 Print a description of the given variable.
63 Show default value(s) only (this is the same as setting RC_CONFS to NULL or
64 passing `-f' with a NULL file-argument).
66 Print query results as
68 .Pq useful for producing output to be fed back in .
73 Operate on the specified file(s) instead of the files obtained by reading the
78 This option can be specified multiple times for additional files.
82 file each directive is in.
84 Print a short usage message to stderr and exit.
86 Print a full usage statement to stderr and exit.
88 Ignore unknown variables.
95 .Pq overrides So Fl R Ar dir Sc ; requires Xr jexec 8 .
97 Show only variable values, not their names.
99 Show only variable names, not their values.
102 Ignore previous occurrences of
106 Operate within the root directory
112 Print the pathname of the specific
114 file where the directive was found.
116 Remove variable(s) from specified file(s).
119 This utility works similar to
121 It shares the `-e' and `-n' options
123 and also has the same
125 syntax for querying/setting configuration options.
129 serves to query/modify MIBs in the entrant kernel,
131 instead works on values in the system
135 The list of system configuration files is configured in the file
136 .Ql /etc/defaults/rc.conf
139 which by-default contains a space-separated list of pathnames.
141 systems, this defaults to the value "/etc/rc.conf /etc/rc.conf.local".
143 pathname is sourced in-order upon startup.
144 It is in the same fashion that
146 sources the configuration files before returning the value of the given
149 When supplied a variable name,
151 will return the value of the variable.
152 If the variable does not appear in any
155 an error is printed and error status is returned.
157 When changing values of a given variable, it does not matter if the variable
158 appears in any of the
161 If the variable does not appear in any of the files, it is appended to
162 the end of the first pathname in the
167 will replace only the last-occurrence in the last-file found to contain the
169 This gets the value to take effect next boot without heavily
170 modifying these integral files (yet taking care not to allow the file to
173 be called repeatedly).
175 The following environment variables are referenced by
177 .Bl -tag -width ".Ev RC_DEFAULTS"
181 .Pq even if set to NULL .
184 .Ql /etc/defaults/rc.conf
188 The following standard commands are required by
207 .Bl -tag -width ".Pa /etc/defaults/rc.conf" -compact
208 .It Pa /etc/defaults/rc.conf
210 .It Pa /etc/rc.conf.local
213 Below are some simple examples of how
215 can be used to query certain values from the
217 collection of system configuration files:
221 .Dl returns the value of $sshd_enable, usually YES or NO .
225 .Dl returns IP address of default router Pq if configured .
227 Working on other files, such as
231 -f /etc/crontab MAILTO
232 .Dl returns the value of the MAILTO setting Pq if configured .
234 In addition to the above syntax,
238 PARAMETER expansion for changing the way values are reported, shown below:
242 .Dl returns $hostname up to (but not including) first `.' .
245 \&'network_interfaces%%[$IFS]*'
246 .Dl returns first word of $network_interfaces .
249 \&'ntpdate_flags##*[$IFS]'
250 .Dl returns last word of $ntpdate_flags (time server address) .
254 .Dl returns $usbd_flags or "default" if unset or NULL .
257 cloned_interfaces+"alternate"
258 .Dl returns "alternate" if $cloned_interfaces is set .
261 \&'#kern_securelevel'
262 .Dl returns length in characters of $kern_securelevel .
266 .Dl returns NULL and error status 2 if $hostname is unset Pq or if set, returns the value of $hostname with no error status .
270 .Dl returns NULL and error status 2 if $hostname is unset or NULL Pq or if set and non-NULL, returns value without error status .
274 utility presently does not support the
276 collection of system configuration files
277 .Pq which requires a service name to be known during execution .
279 This will be corrected by a future enhancement.
290 utility first appeared in
293 .An Devin Teske Aq dteske@FreeBSD.org
295 Brandon Gooch, Garrett Cooper, Julian Elischer, Pawel Jakub Dawidek,
296 Cyrille Lefevre, Ross West, Stefan Esser, Marco Steinbach, and Jilles Tjoelker
297 for suggestions and help.