bsh Posted January 8, 2012 Share Posted January 8, 2012 I'm writing a shell script to automate changing my mac addresses. How can I set a variable to equal a mac? for example #!/bin/bash #chg mac and bring up interfaces ifconfig wlan0 down ifconfig wlan1 down macchanger -r wlan0 macchanger -r wlan1 ifconfig wlan0 up ifconfig wlan1 up #GW is new mac address for wlan0 GW=xx:xx:xx:xx:xx:xx #SNIFF is new mac address for wlan1 SNIFF=yy:yy:yy:yy:yy:yy Is there a command that will only return the mac or how do I parse the output of macchanger -s ? Quote Link to comment Share on other sites More sharing options...
Infiltrator Posted January 8, 2012 Share Posted January 8, 2012 This example might give you some ideas, of how to set up variables in bash https://community.elearnsecurity.com/index.php?/topic/563-bash-script-to-set-random-mac-and-hostname/ Quote Link to comment Share on other sites More sharing options...
bsh Posted January 8, 2012 Author Share Posted January 8, 2012 This example might give you some ideas, of how to set up variables in bash https://community.elearnsecurity.com/index.php?/topic/563-bash-script-to-set-random-mac-and-hostname/ Thanks. That is interesting. He's using md5sum to generate random values; setting them to variables and stringing them together to make a random mac. What could be more interesting, would be to use macchanger to make a valid random mac: GW=`macchanger -A wlan0`; echo $GW Current MAC: 00:60:bb:b6:40:11 (Cabletron - Netlink, Inc.) Faked MAC: 00:dd:00:c7:00:ba (Ungermann-bass Inc.) My problem is $GW has all that crap in it. I just need GW=00:dd:00:c7:00:ba Quote Link to comment Share on other sites More sharing options...
bsh Posted January 8, 2012 Author Share Posted January 8, 2012 Solved. GW=`macchanger -s wlan0 | cut -d' ' -f3` export GW In a nutshell, macchanger -s wlan0 will output the string: Current MAC: 00:d0:d2:e7:9c:d1 (Epilog Corporation) The cut command says using space as a delimiter: -d' ' cut out the 3rd field position for me -f3 00:d0:d2:e7:9c:d1 Quote Link to comment Share on other sites More sharing options...
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