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This article mainly explains "how to read multiple files at the same time under shell". The content in the article is simple and clear, and it is easy to learn and understand. Please follow the editor's train of thought to study and learn "how to read multiple files at the same time under shell".

1. Reading of a single file

Under the shell script, you can read files by line in a variety of ways, as follows:

For line in `cat ${input_filename} `do echo $linedonewhile read linedo echo $linedone

> filenfile

The n here represents the file descriptor of the open file file, similar to fd in other programming languages. If n is not specified, the default behavior is as follows:

Filefile # same as 0file

We can use the exec command to open the file we want to redirect:

Exec 7

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