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

Question

I often need to kill a process during programming   The way I do it now is        ps aux   grep  python csp build py  user    5124  1 0  0 3 214588 13852 pts 4    Sl   11 19   0 00 python csp build py user    5373  0 0  0 0   8096   960 pts 6    S    11 20   0 00 grep python csp build py      kill 5124   How can I extract the process id automatically and kill it in the same line   Like this        ps aux   grep  python csp build py    kill  lt regex that returns the pid gt

User · Answer

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

User · Answer

Try using   ps aux   grep  python csp build py    head -1   cut -d     -f 2   xargs kill

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To kill process by keyword midori  for example   kill -SIGTERM   pgrep -i midori

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I use this to kill Firefox when it s being script slammed and cpu bashing    Replace  Firefox  with the app you want to die  I m on the Bash shell - OS X 10 9 3 Darwin   kill -Hup   ps ux   grep Firefox   awk  NR    1  next   print  2     uniq   sort

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You may use only pkill   python   for regex process killing    If you want to see what you gonna kill or find before killing just use pgrep -l   python   where -l outputs also name of the process  If you don t want to use  pkill  use just   pgrep   python     xargs kill

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The solution would be filtering the processes with exact pattern   parse the pid  and construct an argument list for executing kill processes   ps -ef    grep -e  lt serviceNameA gt  -e  lt serviceNameB gt  -e  lt serviceNameC gt    awk   print  2     xargs sudo kill -9   Explanation from documenation      ps utility displays a header line  followed by lines containing   information about all of your processes that have controlling terminals       -e Display information about other users  processes  including those      -f Display the uid  pid  parent pid  recent CPU usage  process start      The grep utility searches any given input files  selecting lines that      -e pattern  --regexp pattern                Specify a pattern used during the search of the input  an input                line is selected if it matches any of the specified patterns                 This option is most useful when multiple -e options are used to                specify multiple patterns  or when a pattern begins with a dash                  -         xargs - construct argument list s  and execute utility      kill - terminate or signal a process      number 9 signal - KILL  non-catchable  non-ignorable kill    Example   ps -ef    grep -e node -e loggerUploadService sh - -e applicationService js   awk   print  2     xargs sudo kill -9

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ps -o uid pid cmd awk   if  1   username   amp  amp   3   your command   print  2   xargs kill -15

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You don t need the user switch for ps   kill  ps ax   grep  python csp build py    awk   print  1

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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 gt  sleep 3600  amp   1  2225 pax gt  sleep 3600  amp   2  2226 pax gt  sleep 3600  amp   3  2227 pax gt  sleep 3600  amp   4  2228 pax gt  sleep 3600  amp   5  2229 pax gt  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  amp  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  -

User · Answer

My task was kill everything matching regexp that is placed in specific directory  after selenium tests not everything got stop   This worked for me   for i in  ps aux   egrep  firefox chrome selenium opera  grep   home dir1 dir2  awk   print  2   uniq   do kill  i  done

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Kill our own processes started from a common PPID is quite frequently  pkill associated to the    P flag is a winner for me  Using  ghostdog74 example      sleep 30  amp                                                                                                         1  68849   sleep 30  amp   2  68879   sleep 30  amp   3  68897   sleep 30  amp   4  68900   pkill -P                                                                                                              1    Terminated              sleep 30  2    Terminated              sleep 30  3 -  Terminated              sleep 30  4    Terminated              sleep 30

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In some cases  I d like kill processes simutaneously like this way         sleep 1000    1  25410       sleep 1000    2  25415       sleep 1000    3  25421       pidof sleep 25421 25415 25410       kill  pidof sleep   2   - 25415 terminated  sleep 1000                                                               1   - 25410 terminated  sleep 1000  3     25421 terminated  sleep 1000  But  I think it is a little bit inappropriate in your case  May be there are running python a  python b  python x   in the background

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The following command will come handy   kill   ps -elf   grep  lt process regex gt   awk   print  4     eg   ps -elf   grep top      0 T ubuntu    6558  6535  0  80   0 -  4001 signal 11 32 pts 1    00 00 00 top     0 S ubuntu    6562  6535  0  80   0 -  2939 pipe w 11 33 pts 1    00 00 00 grep --color auto top   kill -  ps -elf   grep top  awk   print  4         -bash  kill   6572  - No such process      1    Killed                  top   If the process is still stuck  use  -9  extension to hardkill  as follows   kill -9   ps -elf   grep top  awk   print  4     Hope that helps

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Using -C flag of ps command  -C cmdlist      Select by command name   This selects the processes whose      executable name is given in cmdlist    1st case  simple command So if you run your script by standard shebang and calling them by his name   path to csp build py  You may find them whith ps -C csp build py  So kill   ps -C csp build py ho pid   may be enough  2nd case  search for cmd A little more strong  but still a lot quicker than most other answer in this SO question    If you don t know ho this is run  or if you run them by python csp build py python3 csp build py python  path to csp build py  You may find them by running  ps -C python python3 csp build py who pid cmd   grep csp build py  Then using sed  kill   ps -C python python3 csp build py who pid cmd       sed -ne   csp build py s       0-9           1 p

User · Answer

you can do it with awk and backtics  ps auxf  grep  python csp build py   awk    print  kill    2        2 in awk prints column 2  and the backtics runs the statement that s printed   But a much cleaner solution would be for the python process to store it s process id in  var run and then you can simply read that file and kill it

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A method using only awk  and ps    ps aux   awk   11    12     python csp build py    system  kill    2       By using string equality testing I prevent matching this process itself

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Find and kill all the processes in one line in bash   kill -9   ps -ef   grep   lt exe name gt     grep -v  grep    awk   print  2       ps -ef   grep   lt exe name gt   - Gives the list of running process details  uname  pid  etc   which matches the pattern  Output list includes this grep command also which searches it  Now for killing we need to ignore this grep command process  ps -ef   grep   lt exec name gt     grep -v  grep  - Adding another grep with -v  grep  removes the current grep process  Then using awk get the process id alone  Then keep this command inside        and pass it to kill command  to kill all process

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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     p keyword   lists out all Processes containing keyword usage e g  p csp build   p python etc    bash profile code     FIND PROCESS function p            ps aux   grep -i  1   grep -v grep      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 ALL function 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

User · Answer

killall -r regexp  -r  --regexp   Interpret process name pattern as an extended regular expression

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This will return the pid only  pgrep -f  process name    So to kill any process in one line   kill -9   pgrep -f  process name     or  if you know the exact name of the process you can also try pidof   kill -9   pidof  process name     But  if you do not know the exact name of the process  pgrep would be better   If there is multiple process running with the same name  and you want to kill the first one then   kill -9   pgrep -f  process name    head -1    Also to note that  if you are worried about case sensitivity then you can add -i option just like in grep  For example   kill -9   pgrep -fi chrome    More info about signals and pgrep at man 7 signal or man signal and man pgrep

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You can use below command to list pid of the command  Use top or better use htop to view all process in linux  Here I want to kill a process named  ps -ef   grep   usr lib something somelocation some process js     grep -v grep   awk   print  2     And verify the pid  It must be proper To kill them use kill command   sudo kill -9  ps -ef   grep   usr lib something somelocation some process js     grep -v grep   awk   print  2      Eg -  is from htop process list   sudo kill -9  ps -ef   grep   lt process gt      grep -v grep   awk   print  2      This resolves my issues  Always be prepared to restart process if you accidentally kill a process

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I started using something like this   kill   pgrep  python csp build py

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Give -f to pkill   pkill -f  usr local bin fritzcap py   exact path of  py file is     ps ax   grep fritzcap py  3076 pts 1    Sl     0 00 python -u  usr local bin fritzcap py -c -d -m

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If pkill -f csp build py doesn t kill the process you can add -9 to send a kill signall which will not be ignored  i e  pkill -9 -f csp build py

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Use pgrep - available on many platforms   kill -9  pgrep -f cps build    pgrep -f will return all PIDs with coincidence  cps build

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I use gkill processname  where gkill is the following script   cnt  ps aux grep  1  grep -v  grep  -c  if     cnt  -gt 0   then     echo  Found  cnt processes - killing them      ps aux grep  1  grep -v  grep   awk   print  2    xargs kill else     echo  No processes found  fi   NOTE  it will NOT kill processes that have  grep  in their command lines

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

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