How to Delete Files Older Than Specified Days in Linux
As you might already know, we use the rm command in Linux to delete files and folders. The filenames to be deleted have to be
How to Block a Port Using a Firewall in Linux
A firewall is either a software-based or, in some cases, a hardware-based security system for networks. It automatically monitors traffic inflow and outflow on the
Fix Nginx Error: 413 Request Entity Too Large
When Nginx is used as a backend server for web apps like WordPress, Drupal, etc. (which are usually PHP and MySQL Database based), many users
How to Limit Depth of ‘tree’ for Recursive File Listing
Usually, the ls command is used in Linux to display files and folders. It is an inbuilt command in GNU/Linux. However, it has its shortcomings,
How to Reverse Lines in a File Character-Wise in Linux
There are some string manipulation or alternation tasks that can be programmed in scripting or a programming language quite easily. For example, changing the case
How to Find and Close Open Ports in Linux
Network and Server administration is one of the key areas in which Linux is actually preferred to any other operating system. Hence most data center
How to Find What IP Addresses are Connected to Linux
A server is application software that listens to requests over a network and returns the requested files, data, etc. Linux machines have servers installed for
How to Fix /bin/rm: cannot execute [Argument list too long]
The rm command is used in Linux to delete files and directories. It can be used to delete a few files by specifying each file
How to Use Sed to Find and Replace String in Files
Sed (short for Stream Editor) is a command-line utility in GNU/Linux operating systems used to modify text files. It can be considered as a command-line