6.7 KiB
Have a cow at the Linux command line
Bring a bovine voice to your terminal output with the cowsay utility.
Welcome to the fourth day of the Linux command-line toys advent calendar. If this is your first visit to the series, you might be asking yourself, what’s a command-line toy. We’re figuring that out as we go, but generally, it could be a game, or any simple diversion that helps you have fun at the terminal.
Some of you will have seen various selections from our calendar before, but we hope there’s at least one new thing for everyone. Because just about everyone who I’ve mentioned this series to has asked me about it already, today’s selection is an obligatory one.
You didn’t think we’d make it through this series without mentioning cowsay, did you?
Cowsay is an udderly fantastic utility that takes text and outputs it as the spoken text of an ASCII-art bovine.
You’ll likely find cowsay packaged in your default repositories, and perhaps even already installed. For me, in Fedora, all it took to install was:
$ sudo dnf install -y cowsay
Then, invoke it with cowsay followed by your message. Perhaps you’d like to pipe in the fortune utility we talked about yesterday.
$ fortune | cowsay
_________________________________________
/ If at first you do succeed, try to hide \
\ your astonishment. /
-----------------------------------------
\ ^__^
\ (oo)\_______
(__)\ )\/\
||----w |
|| ||
That’s it! Cowsay ships with few variations, called cow files, that can usually be found in /usr/share/cowsay. To see the cow file options available on your system, use -l flag after cowsay. Then, use the -f flag to try one out.
$ cowsay -f dragon "Run for cover, I feel a sneeze coming on."
_______________________________________
/ Run for cover, I feel a sneeze coming \
\ on. /
---------------------------------------
\ / \ //\
\ |\___/| / \// \\
/0 0 \__ / // | \ \
/ / \/_/ // | \ \
@_^_@'/ \/_ // | \ \
//_^_/ \/_ // | \ \
( //) | \/// | \ \
( / /) _|_ / ) // | \ _\
( // /) '/,_ _ _/ ( ; -. | _ _\.-~ .-~~~^-.
(( / / )) ,-{ _ `-.|.-~-. .~ `.
(( // / )) '/\ / ~-. _ .-~ .-~^-. \
(( /// )) `. { } / \ \
(( / )) .----~-.\ \-' .~ \ `. \^-.
///.----..> \ _ -~ `. ^-` ^-_
///-._ _ _ _ _ _ _}^ - - - - ~ ~-- ,.-~
/.-~
My real beef with cowsay is that I don’t have enough time today to really milk the cow puns for all they are worth. The steaks are just too high, and I might butcher the joke.
On a more serious note, I had completely forgotten about cowsay until I re-encountered it when learning Ansible playbooks. If you happen to have cowsay installed, when you run a playbook, you’ll get your output from a series of cows. For example, running this playbook:
- hosts:
- localhost
tasks:
- action: ping
Might give you the following:
$ ansible-playbook playbook.yml
__________________
< PLAY [localhost] >
------------------
\ ^__^
\ (oo)\_______
(__)\ )\/\
||----w |
|| ||
________________________
< TASK [Gathering Facts] >
------------------------
\ ^__^
\ (oo)\_______
(__)\ )\/\
||----w |
|| ||
ok: [localhost]
_____________
< TASK [ping] >
-------------
\ ^__^
\ (oo)\_______
(__)\ )\/\
||----w |
|| ||
ok: [localhost]
____________
< PLAY RECAP >
------------
\ ^__^
\ (oo)\_______
(__)\ )\/\
||----w |
|| ||
localhost : ok=2 changed=0 unreachable=0 failed=0
Cowsay is available under a GPLv3 license, and you can find the Perl source code on GitHub. I’ve also seen versions floating around in other languages, so take a look around for other variants; here’s one in R, for example. Implementing your own version in your language of choice might even be a fun programming learning task.
Now that cowsay is out of the way, we can move on to greener pastures.
Do you have a favorite command-line toy that you think I ought to profile? The calendar for this series is mostly filled out but I've got a few spots left. Let me know in the comments below, and I'll check it out. If there's space, I'll try to include it. If not, but I get some good submissions, I'll do a round-up of honorable mentions at the end.
Check out yesterday's toy, How to bring good fortune to your Linux terminal, and check back tomorrow for another!
via: https://opensource.com/article/18/12/linux-toy-cowsay
作者：Jason Baker 选题：lujun9972 译者：译者ID 校对：校对者ID