How shell deletes the first three lines

This article will explain in detail how to delete the first three lines of shell. The editor thinks it is very practical, so I share it for you as a reference. I hope you can get something after reading this article.

Delete the first three lines

$cat a.txt | what is sed 1 sed 3D shell? Shell is a program written in C language that serves as a bridge for users to use Linux. Shell is both a command language and a programming language. Shell also refers to an application that provides an interface through which users access the services of the operating system kernel.

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