Find and kill a process in one line using bash and regex

In bash, you should be able to do:

kill $(ps aux | grep '[p]ython csp_build.py' | awk '{print $2}')

Details on its workings are as follows:

• The ps gives you the list of all the processes.
• The grep filters that based on your search string, [p] is a trick to stop you picking up the actual grep process itself.
• The awk just gives you the second field of each line, which is the PID.
• The $(x) construct means to execute x then take its output and put it on the command line. The output of that ps pipeline inside that construct above is the list of process IDs so you end up with a command like kill 1234 1122 7654.

Here's a transcript showing it in action:

pax> sleep 3600 &[1] 2225pax> sleep 3600 &[2] 2226pax> sleep 3600 &[3] 2227pax> sleep 3600 &[4] 2228pax> sleep 3600 &[5] 2229pax> kill $(ps aux | grep '[s]leep' | awk '{print $2}')[5]+  Terminated              sleep 3600[1]   Terminated              sleep 3600[2]   Terminated              sleep 3600[3]-  Terminated              sleep 3600[4]+  Terminated              sleep 3600

and you can see it terminating all the sleepers.

Explaining the grep '[p]ython csp_build.py' bit in a bit more detail:

When you do sleep 3600 & followed by ps -ef | grep sleep, you tend to get two processes with sleep in it, the sleep 3600 and the grep sleep (because they both have sleep in them, that's not rocket science).

However, ps -ef | grep '[s]leep' won't create a process with sleep in it, it instead creates grep '[s]leep' and here's the tricky bit: the grep doesn't find it because it's looking for the regular expression "any character from the character class [s] (which is s) followed by leep.

In other words, it's looking for sleep but the grep process is grep '[s]leep' which doesn't have sleep in it.

When I was shown this (by someone here on SO), I immediately started using it because

• it's one less process than adding | grep -v grep; and
• it's elegant and sneaky, a rare combination :-)

if you have pkill,

pkill -f csp_build.py

If you only want to grep against the process name (instead of the full argument list) then leave off -f.

One liner:

ps aux | grep -i csp_build | awk '{print $2}' | xargs sudo kill -9

• Print out column 2: awk '{print $2}'
• sudo is optional
• Run kill -9 5124, kill -9 5373 etc (kill -15 is more graceful but slightly slower)

Bonus:

I also have 2 shortcut functions defined in my .bash_profile(~/.bash_profile is for osx, you have to see what works for your *nix machine).

1. p keyword
   • lists out all Processes containing keyword
   • usage e.g: p csp_build , p python etc

bash_profile code:

# FIND PROCESSfunction p(){        ps aux | grep -i $1 | grep -v grep}

2. ka keyword
   • Kills All processes that have this keyword
   • usage e.g: ka csp_build , ka python etc
   • optional kill level e.g: ka csp_build 15, ka python 9

bash_profile code:

# KILL ALLfunction ka(){    cnt=$( p $1 | wc -l)  # total count of processes found    klevel=${2:-15}       # kill level, defaults to 15 if argument 2 is empty    echo -e "\nSearching for '$1' -- Found" $cnt "Running Processes .. "    p $1    echo -e '\nTerminating' $cnt 'processes .. '    ps aux  |  grep -i $1 |  grep -v grep   | awk '{print $2}' | xargs sudo kill -klevel    echo -e "Done!\n"    echo "Running search again:"    p "$1"    echo -e "\n"}