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This article mainly introduces shell how to replace the foo in the previous command with bar, which has a certain reference value, and interested friends can refer to it. I hope you can learn a lot after reading this article.

Replace foo in the previous command with bar and execute.

The code is as follows:

What is Shell? Shell is a program written in C language, it is 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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