You now have the Linux fundamentals needed for SRE interviews.
Key concepts:
- Processes: states, fork/exec/wait, zombies
- Memory: virtual memory, paging, OOM killer
- Filesystems: inodes, hard/soft links, file descriptors
- Permissions: user/group/other, SUID, sticky bit
- Boot: BIOS → bootloader → kernel → systemd
Key commands: ps, top, strace, lsof, free, vmstat, systemctl, journalctl
Practice: When something breaks, use these tools to investigate systematically rather than guessing.