Tips

great book about the cli: https://shop.fsf.org/books-docs/introduction-command-line
When a parent process dies, the children does not die together, their parent become init https://unix.stackexchange.com/questions/158727/is-there-any-unix-variant-on-which-a-child-process-dies-with-its-parent/158736#158736
To kill services using systemd: https://0pointer.de/blog/projects/systemd-for-admins-4.html
Systemd can be set to kill the main process or the cgroup
- Systemd creates a special cgroup for each service running
- this won’t work if you fork a process in a different cgroup
- https://www.freedesktop.org/software/systemd/man/systemd.service.html
You may need to use nsenter in order to get more info about lsof https://serverfault.com/questions/1000338/in-lsof-output-what-are-those-sock-lines/1000366#1000366
To know which shared libraries a program is using: ldd /usr/bin/curl (LD_LIBRARY_PATY tells the program where to look for shared libraries)
dstat Every second it prints out how many bytes were written to the network/disk that second
opensnoop -p PID prints out in real time every file being open by a program (uses eBPF)
https://github.com/iovisor/bcc
you can use netcat to create http requests
netstat -tunapl to know which process is listening to a port
ngrep => network grep

rofi -show

Guides