What command is used to search a specific case insensitive word in a file in SSH?

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Linux:

Linux is a free and open-source operating system that was first developed by Linus Torvalds and friends that was first announced on August 25, 1991.

GREP Command:

The ‘GREP’ is a command line search utility or tool to filter the input given to it. The ‘Grep’ got it’s name from ed editor as g/re/p (global / regular expression / print). It can improve a command output by filtering out the required information. The ‘Grep’ will become a killer command when we combine it with regular expressions. The ‘grep -i’ command is used to find the specific word. It is a case-insensitive. We can type in lowercase, uppercase or a mix of both.

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