How to get the process ID to kill a nohup process?
bash, grep, linux, nohup
Solution
When using `nohup` and you put the task in the background, the background operator (`&`) will give you the PID at the command prompt. If your plan is to manually manage the process, you can save that PID and use it later to kill the process if needed, via `kill PID` or `kill -9 PID` (if you need to force kill). Alternatively, you can find the PID later on by `ps -ef | grep "command name"` and locate the PID from there. Note that `nohup` keyword/command itself does not appear in the `ps` output for the command in question.
If you use a script, you could do something like this in the script:
nohup my_command > my.log 2>&1 &
echo $! > save_pid.txt
This will run `my_command` saving all output into `my.log` (in a script, `$!` represents the PID of the last process executed). The `2` is the file descriptor for standard error (`stderr`) and `2>&1` tells the shell to route standard error output to the standard output (file descriptor `1`). It requires `&1` so that the shell knows it's a file descriptor in that context instead of just a file named `1`. The `2>&1` is needed to capture any error messages that normally are written to standard error into our `my.log` file (which is coming from standard output). See I/O Redirection for more details on handling I/O redirection with the shell.
If the command sends output on a regular basis, you can check the output occasionally with `tail my.log`, or if you want to follow it "live" you can use `tail -f my.log`. Finally, if you need to kill the process, you can do it via:
kill -9 `cat save_pid.txt`
rm save_pid.txt
Problem
I'm running a nohup process on the server. When I try to kill it my putty console closes instead. this is how I try to find the process ID: ``` ps -ef |grep nohup ``` this is the command to kill ``` kill -9 1787 787 ```