Question

68

How to write a shscript to kill -9 a pid which is found via lsof -i

rated 0 times [ 68] [ 0] / answers: 1 / hits: 36002 / 3 Years ago, mon, september 13, 2021, 1:35:50

I'm using tomcat, and sometimes when I tell it to stop it doesn't properly kill the process.

My way around this is too do:

lsof -i tcp:8080

which outputs:

COMMAND PID USER   FD   TYPE DEVICE SIZE/OFF NODE NAME

java    888 root   35u  IPv6 780659      0t0  TCP *:http-alt (LISTEN)

java    888 root   39r  IPv6 790103      0t0  TCP localhost:58916->localhost:http-alt (CLOSE_WAIT)

java    888 root   40r  IPv6 792585      0t0  TCP localhost:58936->localhost:http-alt (CLOSE_WAIT)

java    888 root   75r  IPv6 785553      0t0  TCP localhost:58701->localhost:http-alt (CLOSE_WAIT)

java    888 root   77r  IPv6 787642      0t0  TCP localhost:58814->localhost:http-alt (CLOSE_WAIT)

java    888 root  130u  IPv6 783894      0t0  TCP localhost:58686->localhost:http-alt (CLOSE_WAIT)

java    888 root  353u  IPv6 780929      0t0  TCP localhost:58632->localhost:http-alt (CLOSE_WAIT)

I then run

kill -9 pid

I want a way to get all the pid numbers and kill them. Thing is I don't know how to isolate that field.

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fulerio

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answered 3 Years ago bleger · Accepted Answer

There is a -t (terse) option in lsof, which seems to do exactly what you are looking for i.e.

$ sudo lsof -ti tcp:80

1387

4538

4539

See man lsof

-t       specifies  that  lsof should produce terse output with process

         identifiers only and no header - e.g., so that the output  may

         be piped to kill(1).  -t selects the -w option.

Assuming you have the necessary permissions, you can pass the result to kill as a list of PIDs with command substitution:

kill -9 $(lsof -ti tcp:80)