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Stopping "Contingency"

http://shelr.tv/records/51a91d5c9660805920000001


Notes:

  • "contingency" is just a little shell script that resists being killed with SIGINT (SIGnal INTerrupt) and SIGABRT (SIGnal ABoRT)
  • Since I was running as 'AUX_ADMIN', I wasn't going to actually delete the account.
  • I was using ZSH
  • killall -ABRT contingency should really be 'rmmod contingency' or 'modprobe -r contingency'

Code for 'contingency':

#!/usr/local/bin/zsh
trap "echo PERMISSION DENIED" SIGINT SIGABRT
trap "echo OPERATION SUSPENDED" SIGHUP
trap "echo TERMINATING PROCESSES..." SIGTERM

while :
do
done

Code for 'delete':

echo "USER DELETED" # rather anticlimactic, isn't it?

'AUX_ADMIN's ~/.zshrc

export PS1="
[!] "
export PATH=$PATH:$HOME/.bin

For the curious ones, here's a breakdown of what is done.

1.'contingency &' launches the program 'contingency', but runs it in the background. Without the ampersand (&), it wouldn't process any input.

2.'whoami' prints out the current user

3.'ps -U AUX_ADMIN' prints all the processes (ps) of the user AUX_ADMIN (-U AUX_ADMIN)

4.'killall -INT contingency' tries to send the Interrupt signal to all programs named contingency

5.'killall -ABRT contingency' tries to send the Abort signal to all the programs named contingency

6.'delete -u AUX_ADMIN' doesn't really do anything. In fact, there is not normally a 'delete' program in Linux.

7.'killall -STOP contingency' stops contingency in its tracks.

8.'killall -KILL contingency' forces contingency to quit.

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