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Processes

Commands

Command Description
systemctl start / stop / status of processes
ps list all running processes
kill send a termination signal to a process
ss show open ports and network connections

Tasks

1. Show the systemctl status

sudo systemctl status

2. Show the sshd status

sudo systemctl status ssh

3. Show all enabled services

sudo systemctl list-unit-files --type=service --state=enabled

4. Restart the ssh service

sudo systemctl restart ssh

5. Disable the open-vm-tools.service service

sudo systemctl disable open-vm-tools.service

6. Enable the service

sudo systemctl enable open-vm-tools.service

7. Show all running processes

ps aux

8. Remove the ones that have a '[' in the cmd

ps aux | grep -v '\['

dkofler@ibk-tr-deb12:~$ ps aux | grep -v '\['
USER         PID %CPU %MEM    VSZ   RSS TTY      STAT START   TIME COMMAND
polkitd    13358  0.0  0.2 308164  8016 ?        Ssl  11:39   0:00 /usr/lib/polkit-1/polkitd --no-debug
root       13386  0.0  0.3 391872 12496 ?        Ssl  11:39   0:00 /usr/sbin/ModemManager
otelcol+   14669  0.7  5.3 1629168 208392 ?      Ssl  11:40   0:18 /usr/bin/otelcol-contrib --config=/etc/otelcol-contrib/config.yaml

9. Create a new process and send it to the background

ping -i 2 8.8.8.8 > /dev/null &

10. Find the ping process in the process list

ps aux | grep ping

11. Kill the process and use the ps command again

kill -9 <PID>
ps aux | grep ping

dkofler@ibk-tr-deb12:~$ ps aux | grep ping
dkofler   6427  6026  0 15:13 pts/0    00:00:00 grep ping
[1]+  Killed                  ping 8.8.8.8 > /dev/null

12. List all tcp/udp ports in listening state

sudo ss -tulpn

dkofler@ibk-tr-deb12:~$ sudo ss -tulpn 
Netid            State             Recv-Q             Send-Q                            Local Address:Port                          Peer Address:Port            Process
udp              UNCONN            0                  0                                     127.0.0.1:323                                0.0.0.0:*                users:(("chronyd",pid=13354,fd=5))
udp              UNCONN            0                  0                                    127.0.0.54:53                                 0.0.0.0:*                users:(("systemd-resolve",pid=4580,fd=16))
udp              UNCONN            0                  0                                 127.0.0.53%lo:53                                 0.0.0.0:*                users:(("systemd-resolve",pid=4580,fd=14))
udp              UNCONN            0                  0                              10.42.22.31%ens5:68                                 0.0.0.0:*                users:(("systemd-network",pid=2634,fd=23))
udp              UNCONN            0                  0                                         [::1]:323                                   [::]:*                users:(("chronyd",pid=13354,fd=6))