Pipes and Error Handling
Learn how to connect streams using pipes and how to handle errors.
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Connecting streams using pipes
The concept of Unix pipes was invented by Douglas Mcllroy. This enabled the output of a program to be connected to the input of the next. Take a look at the following command:
echo Hello World! | sed s/World/Node.js/g
In the preceding command, echo will write Hello World! to its standard output, which is then redirected to the standard input of the sed command (thanks to the pipe | operator). Then, sed replaces any occurrence of World with Node.js and prints the result to its ...