Linux Archives - Page 21 of 27

Sed Command to Replace String in File

Sed is a powerful command to work with string & text in Linux. Here is sed command to replace string in file.

Sometimes you may need to view banned IP addresses in Fail2ban. Here is how to show banned IP in Fail2ban.

Sometimes you may need to unban ip addresses with Fail2ban. Here are the steps to do it.

Sometimes you may want to know which shell you are using, which shells are installed on your system and how to change shell. Here is how to do it.

Sometimes you may need to insert text at certain line in Linux. Here is how to do it using ed, sed, awk, commands.

Sometimes you may need to remove Ubuntu from dual boot menu. Here is how to uninstall Ubuntu from dual boot.

Sometimes you may have zombie processes in Linux systems. Here is how to find & kill zombie processes in Linux.

Sometimes you may need to create recovery disk for Ubuntu. Here is how to create startup disk for Ubuntu.

Sudo users can run commands as root in Linux. Here is how to add user to sudoers in Linux.