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lilo as bootmanager, I boot with an
additional variable assignment. The kernel passes this to the
init-processes shell environment. So all processes started by
init can use it. Example:
linux netoff=
This sets up the variable netoff. It is assigned
nothing. I use it as a flag meaning "now I am in the
office". Booting with
linux netetc=
means "now I am at customer site". Using lowercase
variable names is just for convenient typing. If you prefer,
you can use something like NETENVIRON=123.
The real work of processing this variables is done in my
/etc/init.d/netenv. Take a look at this code
fragment:
NETENV=/tmp/netenv # When located in /tmp, script must be called
# AFTER wiping out /tmp has been done ...
...
elif env | grep '^netoff=' > /dev/null; then
(
echo ""# Networkenvironment: Laptop at office (Network-Interface: Ethernet)"
echo "export PROFILE=31"
echo "IPADDR=\"123.456.78.123\""
echo "NETMASK=\"255.255.255.0\""
echo "NETWORK=\"123.456.78.0\""
echo "BROADCAST=\"123.456.78.255\""
echo "GATEWAY=\"123.456.78.1\""
echo "DOMAIN=\"rw.sni.de\""
echo "DNS_1=\"123.456.89.9\""
echo "export RLPR_PRINTHOST=printer-off"
echo "export PRINTER=pr1"
) > $NETENV
elif env | grep '^netetc=' > /dev/null; then
(
echo "# Networkenvironment: Laptop at customer site (Network-Interface: Ethernet)"
echo "export PROFILE=32"
...
echo "export RLPR_PRINTHOST=printer-etc"
echo "export PRINTER=pr1"
) > $NETENV
Output ist written to a world readable file. Scripts which shall use
the assignments simply have to do something like
. /tmp/netenv
For further details you may refer to the included netenv.
As you can see from the code, I do assign not only network stuff, but
also a Variable PROFILE as well as printing
stuff. This makes it possible, to have e.g. ONE
.fvwm95rc.
I would like to show you how to do that when I come back from my vacation.
So far !
Kind regards
Gerd