Using sed command we can insert the text at any matching pattern of the file. Using sed we can insert at any point of the file. Insertion with sed at the beginning of the line If you want to insert the text during the execution of the command use -i option. Sed -i ‘s/^/begin here/’ […]
Firewall plays an important role in the protection of the server. Firewall protects the servers against harmful stuff. Firewall controls the incoming and outgoing traffic by analyzing the packet and determine whether they are allowed through or not based on set of rules. In Linux we uses IPTABLES to manage the firewall rules. But its […]
Some applications runs on a specific ports which need to be opened in the server firewall. By default csf only allow few basic ports, in order to open/allow other ports you need to edit csf configuration file. This article will you to open ports in CSF firewall. Steps to Open Ports in CSF: 1. Open […]
The Secure Shell (ssh) protocol by default uses the port 22. Attackers mostly uses the port 22 in automated attack and changing the default will prevent your server from these automated attack. There are many ways of making your server secure and changing the default ssh port is one of the server hardening. Steps to […]
Normally when we try to unmount a partition or a disk (Cd-rom or any other partitions) in Linux, sometimes we get an error umount: /xxx: device is busy. This is because other resources of the machine are still accessing the drive. You can use the fuser command to kill forcefully mounted partition or you can […]
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