sysconf -- a sysctl(8)-like utility for managing /etc/rc.conf et. al.

Devin Teske dteske at vicor.com
Wed Oct 6 21:21:41 UTC 2010


Oops =)

This version will use grep(1) if installed. Diff below.


dteske at dt.vicor.com Desktop $ diff -pub sysconf.txt{.orig,}
--- sysconf.txt.orig    2010-10-06 13:50:29.000000000 -0700
+++ sysconf.txt 2010-10-06 13:50:45.000000000 -0700
@@ -349,8 +349,7 @@ depend sysconf_set 'local' 'sysconf' '['
        local found=
        local regex="^[[:space:]]*$varname="
        for file in $conf_files; do
-               #if have grep; then
-               if false; then
+               if have grep; then
                        grep -q "$regex" $file && found=1
                else
                        while read LINE; do \
@@ -386,8 +385,7 @@ depend sysconf_set 'local' 'sysconf' '['
        ( found=
          while read -r LINE; do
                if [ ! "$found" ]; then
-                       #if have grep; then
-                       if false; then
+                       if have grep; then
                                match="$( echo "$LINE" | grep "$regex" )"
                        else
                                case "$LINE" in



On Wed, 2010-10-06 at 13:45 -0700, Devin Teske wrote:
> Hello fellow freebsd-hackers,
> 
> Long-time hacker, first-time poster.
> 
> I'd like to share a shell script that I wrote for FreeBSD system
> administration.
> 
> The attached shell script works similar to sysctl(8), but rather than
> querying or working on sysctl MIBs, it instead works on the /etc/rc.conf
> (and /etc/rc.conf.local) files.
> 
> Syntax shown below (available by running the script without arguments):
> 
> Usage: sysconf [OPTIONS] name[=value] ...
> OPTIONS:
>         -h --help   Print this message to stderr and exit.
>         -d          Print list of internal dependencies before exit.
>         -e          Print query results as `var=value' (useful for producing
>                     output to be fed back in). Ignored if -n is specified.
>         -n          Show only variable values, not their names.
> 
> ENVIRONMENT:
>         SYSCONF_SHOW_DEPS     Dump list of dependencies. Must be zero or one
>                               (default: `0')
>         RC_DEFAULTS           Location of `/etc/defaults/rc.conf' file.
> 
> Examples:
> 
> root at mymachine ~ $ sysconf hostname
> hostname: mymachine.localdomain
> root at mymachine ~ $ sysconf hostname=foomaster.deluxe.com
> hostname: mymachine.localdomain -> foomaster.deluex.com
> root at mymachine ~ $ sysconf -e hostname
> hostname="foomaster.deluxe.com"
> root at mymachine ~ $ sysconf -n hostname
> foomaster.deluxe.com
> 
> The script has zero external dependencies. None. Period. It will use
> grep(1) if installed, but it is not required.
> 
> Tested extensively on FreeBSD-4.8, FreeBSD-4.11, FreeBSD-8.0, and
> FreeBSD-8.1.
-- 
Cheers,
Devin Teske

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