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The echo command in Linux is used to display a string provided by the user. For example, use the following command to print Hello, World! Note: Using the echo command without any option returns the provided string as the output, with no changes. Use the --help argument to list all available echo command options:.

Note: Using the echo --help command returns --help as the output. Using the -e option allows you to use escape characters.

These special characters make it easy to customize the output of the echo command. Note: If you are using the -e option, enter your string enclosed in single quotation marks. This ensures that any escape characters are interpreted correctly. Use the cat command to display the content of the file:. It takes stdout and passes it to the command on its right as stdin. If you redirect stdout, nothing will get through the pipe:. So, the pipe does what you wanted to do turn stdout into stdin and connect it to the right command and you don't have to do that yourself by fiddling with file descriptors.

As for why an empty command with redirection doesn't do what you want, see muru's answer. If you want that too, use the tee command as below:. It pipes the output of echo to the input of tee , and then tee writes to the screen and into the file. The symbol is for "piping" or passing the output from one command as input to another command. The grep Global regular expression print command searches a file for a given search string and prints the line it is on.

In your case the file name was 0 which is standard input. So it is redirecting all output to input. Which as best as I can tell is a circular reference that will not work. Which is also appears to be a circular reference. The traditional way of using file descriptor 0 standard input through file redirection is:. If you want to use the echo command and together as Zanna's answer points out you can use:. Ubuntu Community Ask! Sign up to join this community. The best answers are voted up and rise to the top.

Stack Overflow for Teams — Collaborate and share knowledge with a private group. Create a free Team What is Teams? Learn more. Asked 3 years, 9 months ago. Active 3 years, 9 months ago. Viewed 15k times. You create the file object and write into it using only a single line. This is the shortest and most concise way to write stuff into a file. Python programmers will improve their computer science skills with these useful one-liners.

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