From the course: Linux: Bash Shell and Scripts

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Using the coproc command

Using the coproc command - Linux Tutorial

From the course: Linux: Bash Shell and Scripts

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Using the coproc command

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- [Narrator] Let's look at some things we consider to be advanced Bash. For example, coprocesses. Coprocesses is a powerful feature where you can essentially start up a process, a process that acts like a filter, and you can write and read from the process. You're gonna get file descriptors in your shell that reference the standard in and standard out of the process. It's essentially using a pipe. So to make a coprocess, a handy thing is to write a script that can be a filter. So it's gonna read from standard in and write to standard out. Here we have a real simple one. Gonna loop forever, in effect, and it's gonna pipe the input line into the TR command. The TR command is the translate command. And with the translate command, you can give it two strings. And what it does is it translates the corresponding character from the first into the second. So if there's a capital A in the input, it'll turn it into a little a. If there's a capital B it will turn it into a little b. And so…

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