- What is a tunnel and how you can bypass a http proxy?
- What is the difference between IDS and IPS?
- What shortcuts do you use on a regular basis?
- What is the Linux Standard Base?
- What is an atomic operation?
- Your freshly configured http server is not running after a restart, what can you do?
- What kind of keys are in ~/.ssh/authorized_keys and what it is this file used for?
- I’ve added my public ssh key into authorized_keys but I’m still getting a password prompt, what can be wrong?
- Did you ever create RPM’s, DEB’s or solaris pkg’s?
- What does
:(){ :|:& };:do on your system? - How do you catch a Linux signal on a script?
- Can you catch a SIGKILL?
- What’s happening when the Linux kernel is starting the OOM killer and how does it choose which process to kill first?
- Describe the linux boot process with as much detail as possible, starting from when the system is powered on and ending when you get a prompt.
- What’s a chroot jail?
- When trying to umount a directory it says it’s busy, how to find out which PID holds the directory?
- What’s LD_PRELOAD and when it’s used?
- You ran a binary and nothing happened. How would you debug this?
- What are cgroups? Can you specify a scenario where you could use them?
- How can you remove/delete a file with file-name consisting of only non-printable/non-type-able characters?
- How can you increase or decrease the priority of a process in Linux?
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