CODEWITHSUNDEEP
shellcommand-linenohup
Canovice
Canovice

Reputation: 10441

Process ID of nohup process continually updating - cant kill process

I am trying to kill a nohup process in an EC2 instance but so far have been unsuccessful. I am trying to grab the process ID (PID) and then use it with the kill command in terminal, like so:

[ec2-user@ip-myip ~]$ ps -ef |grep nohup 
ec2-user 16580 16153  0 19:50 pts/0    00:00:00 grep --color=auto nohup

with columns, (I believe) they're: 

UID        PID  PPID  C STIME TTY          TIME CMD
ec2-user 16580 16153  0 19:50 pts/0    00:00:00 grep --color=auto nohup

However, each time I try to kill the process, I get an error saying that the PID doesn't exist, seemingly because the PID changed. Here is a sequence I am running into in my command line:

// first try, grab the PID and kill
[ec2-user@ip-myip ~]$ ps -ef |grep nohup 
ec2-user 16580 16153  0 19:50 pts/0    00:00:00 grep --color=auto nohup

[ec2-user@ip-172-31-41-213 ~]$ kill 16580
-bash: kill: (16580) - No such process


// ?? - check for correct PID again, and try to kill again
[ec2-user@ip-myip ~]$ ps -ef |grep nohup 
ec2-user 16583 16153  0 19:50 pts/0    00:00:00 grep --color=auto nohup

[ec2-user@ip-172-31-41-213 ~]$ kill 16583
-bash: kill: (16583) - No such process

// try 3rd time, kill 1 PID up
[ec2-user@ip-myip ~]$ ps -ef |grep nohup 
ec2-user 16584 16153  0 19:50 pts/0    00:00:00 grep --color=auto nohup

[ec2-user@ip-myip ~]$ kill 16585
-bash: kill: (16585) - No such process

This is quite a struggle for me right now, since I need to kill/restart this nohup process. Any help is appreciated!

EDIT - I tried this approach to killing the process because it was posted as an answer in this thread (Prevent row names to be written to file when using write.csv) and was the 2nd highest rated answer.

Upvotes: 0

Views: 1011

Answers (2)

Zulu
Zulu

Reputation: 9275

Very very bad question ...

  1. You are trying to kill you grep process...

    ec2-user 16580 16153  0 19:50 pts/0    00:00:00 grep --color=auto nohup

The command is grep --color=auto nohup

  1. I'm not sure you can kill nohup

nohup will run your command in a particular way. But after its launching, the nohup process dies.

Upvotes: 2

Gilles Quénot
Gilles Quénot

Reputation: 185550

If you want to grep the ps output :

ps -ef | grep '[n]ohup'

or

pgrep -fl nohup

because you are trying to kill not nohup pid but the grep itself...

Upvotes: 1

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