Add a couple of Linux questions
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README.md
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###### Intermediate
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- What type of jobs there are?
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- How do you notify users on build results?
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- Can also be asked like that: what ways there are to notify users on build results?
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- What type of jobs there are? what is the advantage of each type?
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- What ways are you familiar with to notify users on build results?
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###### Advanced
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@ -81,15 +80,39 @@
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- True or False? object are cached for the life of TTL
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## Network
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Network questions can be found [here](https://github.com/bregman-arie/computer-networking/blob/master/interview_questions/README.md)
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## Linux
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##### beginner
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* Explain what each of the following commands does and given an example on how to use it
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* ls
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* rm
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* rmdir (can you achieve the same result by using `rm`?)
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* grep
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* wc
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* df
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* How to change the permissions of a file?
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* What does the following permissions mean?:
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* 777
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* 644
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* 750
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* How to add a new user to the system without providing him the ability to log-in into the system?
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* What commands are you using for troubleshooting issues? specifically:
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* Disk issues
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* Memory, CPU issues
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* Networking issues
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* What is a Linux kernel module and how do you load a new module?
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* What is the different between a soft link and hard link?
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```
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@ -100,7 +123,7 @@ soft links can be created between different file systems while
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hard link can be created only within the same file system.
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```
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* How to run a process in background and why to do that in the first place?
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* How to run a process in the background and why to do that in the first place?
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```
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You can achieve that by specifying & at end of the command.
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As to Why? since some commands/processes can take a lot of time to finish
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