A process is an instance of a computer program that is being
executed.
A process is an instance of a running computer program.
Obtaining information about processes
Some useful tools
top, htop: text-mode system monitors, showing process information in real time
lsof: list process open files. Also netstat specifically for network connections.
ptrace(): a programming interface to see all the system calls that a process is making. Different systems have different command line tools: strace on Linux, ktrace on *BSD, truss on Solaris, dtrace on FreeBSD and Mac OS X, …
I am installing hadoop on my Ubuntu system. When I start it, it reports that port 9000 is busy.
I used:
netstat -nlp|grep 9000
to see if such a port exists and I got this:
tcp 0 0 127.0.0.1:9000 0.0.0.0:* …
I have a process I can't kill with kill -9 . What's the problem in such a case, especially since I am the owner of that process. I thought nothing could evade that kill option.
Sometimes I want to start a process and forget about it. If I start it from the command line, like this:
redshift
I can't close the terminal, or it will kill the process. Can I run a command in such a way that I can close the terminal without…
I have left a script running on a remote machine from when I was locally working at it. I can connect over SSH to the machine as the same user and see the script running in ps.
$ ps aux | grep ipcheck
myuser 18386 0.0 0.0 18460 3476 pts/0 …
I want to have a shell script like this:
my-app &
echo $my-app-pid
But I do not know how the get the pid of the just executed command.
I know I can just use the jobs -p my-app command to grep the pid. But if I want to execute the shell multiple…
I have started a wget on remote machine in background using &. Suddenly it stops downloading. I want to terminate its process, then re-run the command. How can I terminate it?
I haven't closed its shell window. But as you know it doesn't stop using…
I would like to monitor one process's memory / cpu usage in real time. Similar to top but targeted at only one process, preferably with a history graph of some sort.
What command(s) can one use to find out the current working directory (CWD) of a running process? These would be commands you could use externally from the process.
I get the message There are stopped jobs. when I try to exit a bash shell sometimes. Here is a reproducible scenario in python 2.x:
ctrl+c is handled by the interpreter as an exception.
ctrl+z 'stops' the process.
ctrl+d exits python for…
The Linux proc(5) man page tells me that /proc/$pid/mem “can be used to access the pages of a process's memory”. But a straightforward attempt to use it only gives me
$ cat /proc/$$/mem /proc/self/mem
cat: /proc/3065/mem: No such process
cat:…
I accidentally "stopped" my telnet process. Now I can neither "switch back" into it, nor can I kill it (it won't respond to kill 92929, where 92929 is the processid.)
So, my question is, if you have a stopped process on linux command line, how do…
How does one find large files that have been deleted but are still open in an application? How can one remove such a file, even though a process has it open?
The situation is that we are running a process that is filling up a log file at a terrific…
I want to see list of process created by specific user or group of user in Linux
Can I do it using ps command or is there any other command to achieve this?
