nixCraft Linux / UNIX Newsletter

BASH Prepend A Text / Lines To a File under Linux, macOS and Unix

Posted: 24 Aug 2020 07:25 AM PDT

{Updated} I am a new Unix system user with a bash as a default shell. I can append text to a file using >> operator but how do I prepend a text to a file? I want the opposite operation of >> operator. How can I prepend some data to a text file? How do we add text to the beginning of a file in Bash under Linux?

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How to save iptables firewall rules permanently on Linux

Posted: 24 Aug 2020 06:38 AM PDT

How to save iptables firewall rules permanently on Linux
I am using Debian / Ubuntu Linux server. How do I save iptables rules permanently on Linux using the CLI added using the iptables command? How can I store iptables IPv4 and IPv6 rules permanently on the Debian Linux cloud server?

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