How to Set or Change Hostname in Linux
A hostname is a label assigned to a machine that identifies the machine on the network. This tutorial will walk you through the process of changing the hostname in Linux without the need of restarting the system. The steps should work on any modern Linux distribution that uses systemd.
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Du Command in Linux
The du command, short for disk usage reports the estimated amount of disk space used by given files or directories. It is practically useful for finding files and directories taking up large amounts of disk space.
Wc Command in Linux (Count Number of Lines, Words, and Characters)
On Linux and Unix-like operating systems, the wc command allows you to count the number of lines, words, characters, and bytes of each given file or standard input and print the result.
Bash Shebang
The sequence of characters (#!) is called shebang and is used to tell the operating system which interpreter to use to parse the rest of the file.