Top 10 Linux Interview questions and Answers
Top 10 Linux Interview questions and Answers
1. Define Linux?
Linux is an operating system based on UNIX, and was first introduced by Linus Torvalds. It is based on the Linux Kernel, and can run on different hardware platforms manufactured by Intel, MIPS, HP, IBM, SPARC and Motorola. Another popular element in Linux is its mascot, a penguin figure named Tux.
2. What is the Difference between Linux and UNIX?
UNIX originally began as a propriety of operating system from Bell Laboratories, which later on spawned into different commercial versions. On the other hand, Linux is free, open source and intended as a non-propriety operating system for the masses.
3. What is LILO?
LILO is a boot loader for Linux. It is used mainly to load the Linux operating system into main memory so that it can begin its operations.
4. What are basic components of Linux?
Just like any other typical operating system, Linux has all of these components: kernel, shells and GUIs, system utilities, and application program. What makes Linux advantageous over other operating system is that every aspect comes with additional features and all codes for these are downloadable for free.
5. In Linux, what are the names assigned fordifferent serial port?
Serial ports are identified as /dev/ttyS0 to /dev/ttyS7. These are the equivalent names of COM1 to COM8 in Windows.
6. What are the contents in usr/local?
It contains locally installed files. This directory actually matters in environments where files are stored on the network. Specifically, locally-installed files go to /usr/local/bin, /usr/local/lib, etc.). Another application of this directory is that it is used for software packages installed from source, or software not officially shipped with the distribution.
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7. What are the different Modes used invi editor?
There are 3 modes under vi:
– Command mode – this is the mode where you start in
– Edit mode – this is the mode that allows you to do text editing
– Ex mode – this is the mode wherein you interact with vi with instructions to process a file
8. What is redirection?
Redirection is the process of directing data from one output to another. It can also be used to direct an output as an input to another process.
9. What is grep command?
Grep is a search command that makes use of pattern-based searching. It makes use of options and parameters that is specified along the command line and applies this pattern into searching the required file output.
10. How to enable ACLs foe /home partition?
| Add following entry in /etc/fstab LABEL=/home /home ext3 acl 1 2 Now remount /home partition with acl option. mount -t ext3 -o acl /dev/sda3 /home |