Relevant Linux Features: Pipe The pipe is implemented with the " | " symbol. It takes the output (stdout) of the command on the left and sends it as input (stdin) for the command on the right: In the example below, docker run --help is the first command. Its output is used as input to the more command, which displays the output, one screen at a time: Note: stderr (standard error) is NOT passed through the pipe. I.e. we are not able to pass stderr through the pipe as we can stdout . Licensed under a Creative Commons Attribution 4.0 International License .