Linux Interview Questions & Answers Vol 1.0
These are the 51 most important Linux Interview Questions which you must prepare –
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- What is LVM?
- Create a new file “merged.txt” that is a concatenation of “file1.txt” and “file2.txt”
- How to login as a different user in Linux?
- What Is BASH?
- What Is GRUB?
- What is a swap space?
- Describe the root account in Linux?
- What are the kinds of permissions under Linux?
- What is meant by PIPE in Linux?
- What is Zombie Process?
- What is the Crontab?
- How can we list all the process running on a machine?
- What are the different file ownerships in Linux?
- Explain the usage of ‘head’ and ‘tail’ commands.
- How can we introduce wait time in scripts?
- Explain the meaning of the permission mode “drwxr-x–x”?
- What are Regular Expressions (regex)? What is the meaning of *, +, ? in a regular expression?
- What are soft links?
- What are hard links in Linux? How it is different from the soft link?
- What is Samba? Why is it used?
- What is SSH? What is the difference between Telnet and SSH?
- What does curl command do in Linux?
- What is SeLinux?
- What is the difference between CTRL-C and CTRL-Z in the terminal?
- Explain /proc filesystem?
- Which is the core of the operating system?
- What is the purpose of <dmesg> command?
- What is the command to change the group ownership of a file?
- Which command is used to extract first a column from a text file name Test.txt?
- Which command displays the disk consumption of any directory?
- Which command creates an empty file if it does not exist?
- Display all the files and its subdirectories including the hidden files in directory /tmp?
- Which option of rm command is used to remove a directory including all its subdirectories?
- How to identify which shell you are using?
- If you want to login into a system with IP address 192.168.0.1 as a user “john”, then the command would be:
- What is iptables command in Linux? Write a command that appends a rule in the INPUT chain to accept all packets originating from 192.168.1.230.
- How to count the number of words, lines and characters in a file called test.txt?
- What is the output of the following shell script code?
- What will be the output of the following program assuming that command line arguments are cat dog giraffe?
- How to see the list of mounted devices on Linux?
- How would you open a file in read-only mode using the vim editor?
- How do you sort the entries in a text file in ascending order?
- How do you get help about the command “cp”?
- Which file contains the filesystems to be automatically mounted during boot?
- What does the following command do? “who | wc –l”
- How do you find which remote hosts are connecting to your host on a particular port, for example, port 56475?
- There is a file Test.txt which contains words Windows. How will you replace all Windows word with Linux?
- How can you list all the opened files of user sasa?
- How you can find all subdirectories of directory /var/ that have summarized size in Gigabytes?
- Write a script that checks if a file, given as an argument, has more than 10 lines or not. If it does – print “Over 10”, else print “Less than 10”?
- A company is running Web Server apache. Visitors are able to scan the directory tree. Which directive would you configure to stop webserver from listing the directory due to security measure?
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