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Linux Interview Questions and Answers

20. What is LILO?
LILO is Linux Loader is a boot loader for Linux. It is used to load Linux into the memory and start the Operating system.

21. What is the difference between home directory and working directory?
Home directory is the default working directory when a user logs in. On the other hand, working directory is the user's current directory.

22. What is the difference between internal and external commands?
Internal commands are commands that are already loaded in the system. They can be executed any time and are independent.

23. Explain the difference between a static library and a dynamic library.
Static libraries are loaded when the program is compiled and dynamically-linked libraries are loaded in while.

24. What is LD_LIBRARY_PATH?
LD_LIBRARY_PATH is an environment variable. It is used for debugging a new library or a non standard library.

25. What is the file server in Linux server?
File server is used for file sharing. It enables the processes required fro sharing.

26. What is NFS? What is its purpose?
NFS is Network File system. It is a file system used for sharing of files over a network.

27. How do I send email with linux?
Email can be sent in Linux using the mail command.

28. Explain RPM (Red Hat Package Manager) features.
RPM is a package managing system (collection of tools to manage software packages).

29. What is Kernel? Explain the task it performs.
Kernel is used in UNIX like systems and is considered to be the heart of the operating system.

30. What is Linux Shell? What is Shell Script?
Linux shell is a user interface used for executing the commands. Shell is a program the user.

31. What are Pipes? Explain use of pipes.
A pipe is a chain of processes so that output of one process (stdout) is fed an input (stdin) to another.

32. Explain trap command; shift Command, getopts command of linux.
Trap command: controls the action to be taken by the shell when a signal is received.

33. What Stateless Linux server? What feature it offers?
A stateless Linux server is a centralized server in which no state exists on the single workstations.

34. What does nslookup do? Explain its two modes.
Nslookup is used to find details related to a Domain name server. Details like IP addresses of a machine, MX records.

35. What is Bash Shell?
Bash is a free shell for UNIX. It is the default shell for most UNIX systems. It has a combination of the C and Korn shell features.

36. Explain some Network-Monitoring Tools in Linux: ping, traceroute, tcpdump, ntop
Network monitoring tools are used to monitor the network, systems present on the network, traffic etc.

37.How does the linux file system work?
Linux file structure is a tree like structure. It starts from the root directory, represented by '/', and then expands into sub-directories.

38. What is a zombie?
Zombie is a process state when the child dies before the parent process. In this case the structural information of the process is still in the process table.

39. Explain each system calls used for process management in linux.
System calls used for Process management.

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