Exercise 13: Stream a File (cat)

You're going to do some more setup for this one so you get used to making files in one program and then accessing them from the command line. With the same text editor from the last exercise, create another file named test2.txt but, this time save it directly to your temp directory.

Do This

Linux/macOS

$ less test2.txt
[displays file here]
$ cat test2.txt
I am a fun guy.
Don't you know why?
Because I make poems,
that make babies cry.
$ cat test.txt
Hi there this is cool.
$

Windows

> more test2.txt
[displays file here]
> cat test2.txt
I am a fun guy.
Don't you know why?
Because I make poems,
that make babies cry.
> cat test.txt
Hi there this is cool.
>

Remember that when I say [displays file here] I'm abbreviating the output of that command so I don't have to show you exactly everything.

You Learned This

Do you like my poem? Totally going to win a Nobel. Anyway, you already know the first command, and I'm just having you check that your file is there. Then you cat the file to the screen. This command just spews the whole file to the screen with no paging or stopping. To demonstrate that, I have you do this to the test.txt which should just spew a bunch of lines from that exercise.

Do More

  • Make a few more text files and work with cat.
  • Unix: Try cat test.txt test2.txt, and see what it does.
  • Windows: Try cat test.txt,test2.txt, and see what it does.

Buy The Python 3 Edition!

When you buy Learn Python 3 The Hard Way, you'll receive the Python 3 Edition PDF, special access to a paid HTML version, and 12 hours of 1080p video, one video for each exercise. All files are DRM free and you can download them to your computer for offline viewing. Digital Download Only! You do not get a physical book.

$29.99

Buy Digital Download From Zed

Try a a free sample of Learn Python the Hard Way right here, video lectures not included.