Linux

Linux Interview Questions and Answer – Part 7

October 7, 2019 comments off
  • What is the name and the UID of the administrator user?
  • How to list all files, including hidden ones, in a directory?
  • What is the Unix/Linux command to remove a directory and its contents?
  • Which command will show you free/used memory? Does free memory exist on Linux?
  • How to search for the string “my konfu is the best” in files of a directory recursively?
  • How to connect to a remote server or what is SSH?
  • How to get all environment variables and how can you use them?
  • I get “command not found” when I run ifconfig -a. What can be wrong?
  • What happens if I type TAB-TAB?
  • What command will show the available disk space on the Unix/Linux system?
  • What commands do you know that can be used to check DNS records?
  • What Unix/Linux commands will alter a files ownership, files permissions?
  • What does chmod +x FILENAME do?
  • What does the permission 0750 on a file mean?
  • What does the permission 0750 on a directory mean?
  • How to add a new system user without login permissions?
  • How to add/remove a group from a user?
  • What is a bash alias?
  • How do you set the mail address of the root/a user?
  • What does CTRL-c do?
  • What does CTRL-d do?
  • What does CTRL-z do?
  • What is in /etc/services?
  • How to redirect STDOUT and STDERR in bash? (> /dev/null 2>&1)
  • What is the difference between UNIX and Linux.
  • What is the difference between Telnet and SSH?
  • Explain the three load averages and what do they indicate. What command can be used to view the load averages?
  • Can you name a lower-case letter that is not a valid option for GNU ls?
  • What is a Linux kernel module?
  • Walk me through the steps in booting into single user mode to troubleshoot a problem.
  • Walk me through the steps you’d take to troubleshoot a 404 error on a web application you administer.
  • What is ICMP protocol? Why do you need to use?
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