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Linux Basics
Boot
- BIOS/UEFI
- SHIM
- GRUB
- KERNEL
- Init process / process 0
- systemd
- User Space
- Windows manager
Folder
- /bin/
- binaries, sbin: superuser binaries
- /boot/
- /dev/
- devices
- /etc
- /home/
- /media/
- /mnt/
- /opt/
- /proc/
- /root/
- /run/
- /srv/
- /sys/
- /usr/
- /var/
File/Folder permissions
| type | [special] | owner | group | all | ||||||||
| d,-,l | SUID | SGID | Sticky | r | w | x | r | w | x | r | w | x |
| 4 | 2 | 1 | 4 | 2 | 1 | 4 | 2 | 1 | 4 | 2 | 1 | |
File types
- First four bytes ('Magic Bytes') define file type
IPC
| 1 | sighup | stop terminal connection |
| 2 | sigint | interrupt terminal connection |
| 9 | sigkill | |
| 15 | sigterm | |
| 18 | sigcont | |
| 19 | sigstop |