Welcome to the Treehouse Community

Want to collaborate on code errors? Have bugs you need feedback on? Looking for an extra set of eyes on your latest project? Get support with fellow developers, designers, and programmers of all backgrounds and skill levels here with the Treehouse Community! While you're at it, check out some resources Treehouse students have shared here.

Looking to learn something new?

Treehouse offers a seven day free trial for new students. Get access to thousands of hours of content and join thousands of Treehouse students and alumni in the community today.

Start your free trial

Development Tools Console Foundations Environment and Redirection Pipes and Redirection

Posted by A X
A X
12,842 Points

Not understanding the output of $ grep this > hello_grep.txt

Referenced video: https://teamtreehouse.com/library/console-foundations/environment-and-redirection/pipes-and-redirection

Why is $ grep this > hello_grep.txt this is my line another line's result only "this is my line" inside the text file hello_grep.txt and not:

this is my line another line?

1 Answer

Steven Parker
Steven Parker
231,198 Points
Steven Parker
Steven Parker
231,198 Points

:point_right: The command grep this will show all lines with the word "this" in them.

Since the line "another line" does not contain the word "this", it is not included in the output of the command.

A X
A X
12,842 Points

Steven Parker : Ah I thought that the "this is my line another line" was replacing the original contents of the file hello_grep.txt... I didn't realize that it was simply running the results of the grep. It makes sense now, but oy, this video confused me enormously!