Shell script run with mac address validate - linux

Question

Can we run shell script with check system mac address validation then process.
#!/bin/bash
### here i need to check system mac address
### if mac is not match then script will not run
killall gnome-terminal
echo "End Of Day Session Complete"
plz suggest

Answer 1

Why not. First get the mac address of your system and store it in a variable in your shell script or in a config file. Every time when you run the script first get the mac address of the system and compare with the mac id already stored in your script's variable if same continue and if not just exit. Use ifconfig -a command to get the mac address of your system and store it in a config file or in your script.

Answer 2

A hardware adress can be obtained like this:
LC_ALL=C ifconfig | egrep "HWaddr" | awk '{print $5}'
but note:
there might be more than one interface with a mac
on many systems, the mac can be spoofed
To suspend work, just exit. Don't killall, and if you do, don't expect later echo messages to be seen by someone.

Answer 3

As you want to run your code on multiple systems, you could use an associative array to store the MAC addresses of the systems where the script is to be run
declare -A valid_mac
valid_mac["00:00:00:00:00:00"]=1
valid_mac["00:00:00:00:00:01"]=1
valid_mac["00:00:00:00:00:02"]=1
Your script function is to terminate all gnome-terminal sessions on each machine where it is run if the mac address is valid.
Let's define a function
function kill_all_terms(){
killall gnome-terminal
echo "End Of Day Session Complete"
}
Now on each machine you want to get a list of MAC addresses of this machine. There are many ways to do it. The function below lists MAC addresses of all IPv4 interfaces using shell string parsing capabilities
function macs(){
local macs line l1
while read line ; do
l1="${line#*link/ether }" ;
macs="${l1% brd*} ${macs}" ;
done < <( ip -4 -o link ) ;
echo "${macs}"
}
Now we can define the main loop
function main() {
for mac in $(macs) ; do
if [ -n "${valid_mac[$mac]}" ] ; then
kill_all_terms
break
fi
done
}
Finally just run main() as
main "$#"