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processes.md

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Processes

ps -ef                     # List all running processes.
ps aux                     # All running processes with details.

ps -ef | grep <criteria>   # Find a specific process.

kill -9 <pid>              # Kill a process by id.

Output columns:

  • USER – process owner
  • PID – process ID
  • %CPU – CPU usage
  • %MEM – memory usage
  • VSZ – virtual memory size
  • RSS – resident memory size
  • TTY – terminal associated
  • STAT – process state
  • START – start time
  • COMMAND – command that launched it

Errors

Sometimes commands don't run with systemctl i.e. systemd...

systemctl start nginx

ERROR: System has not been booted with systemd as init system (PID 1). Can't operate. Failed to connect to bus: Host is down

...Because in Ubuntu on WSL, many of the common system services still have the "old" init.d scripts available to be used in place of systemctl with Systemd units.

So, for example, you can start nginx with sudo service nginx start, and it will run the /etc/init.d/nginx script with the start argument.

sudo service nginx start

# The same as doing

/etc/init.d/nginx