In this post how to replace and remove one or more lines in a file using sed command with example.

If you may get an error when you install packages in your system like, Ubuntu, CentOS, Fedora, Debian and so on.

Sometimes it is useful to change the current shell for any users. chsh command can help you to manage your login shell.

You may get an error when starting ssh on terminal, touch: cannot touch `'/var/lock/subsys/sshd': No space left on device