These are questions for Unix by which you can use to prepare your Unix job as a technical or as engineer or as an administrator, there are some about programming. 

Admin questions

- How do you list the files in an UNIX directory while also showing hidden files? 
- How do you execute a UNIX command in the background? 
- What UNIX command will control the default file permissions when files are created? 
- Explain the read, write, and execute permissions on a UNIX directory. 
- What is the difference between a soft link and a hard link? 
- Give the command to display space usage on the UNIX file system. 
- Explain iostat, vmstat and netstat. 
- How would you change all occurrences of a value using VI? 
- Give two UNIX kernel parameters that effect an Oracle install 
- Briefly, how do you install Oracle software on UNIX. 

System Admin Interview

- Job Scheduling; mainly crontab, at, batch command 
Backup strategy; incremental, full system back up; diff between tar & ufsdump 
- Diff between hard link & softlink 
- How to list only the directories inside a directory (Ans. ls -l|grep "^d") 
- RAID levels; pros & cons of diffrent levels; what is RAID 1+0 
- How to recover a system whose root password has lost? 
- What is a daemon? 
- How to put a job in background & bring it to foreground? 
- What is default permissions for others in a file? 
- Questions on shell initialization scripts? 
- Questions on restricted shell 
- What is diff betwn grep & find? 
- What is egrep? 
- Questions on shell programming 
- What is a pipe? 
- Questions on Solaris patch management like pkgadd etc 
- Questions on file system creation; actually what happens when we create a file system? 
- Questions on RBAC? what is a role accound & what is a profile? 
- From command line how will you add a user account? the full command will all arguments. 
- Fs it advisable to put a swap partion in RAID1 (mirroring?) pros & cons? 

General UNIX Interview Questions

- What are the main differences between Apache 1.x and 2.x? 
- What does the ”route” command do? 
- What are the read/write/execute bits on a directory mean? 
- What does iostat do? 
- What does vmstat do? 
- What does netstat do? 
- What is the most graceful way to bring a system into single user mode? 
- How do you determine disk usage? 
- What is AWK? 
- What is SED? 
- What is the difference between binaries in /bin, and /usr/bin? 
- What is a dynamically linked file? 
- What is a statically linked file? 

Hope you find the above questions useful for your unix job interview.

more Unix Questions

• Interview Questions with Answers
• Technical Interview - Preparation Questions

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