Check arguments in your Bash script (Bash)

Check arguments in your Bash script

With test -z we can check if a variable’s length is zero. If that is the case, we print some friendly usage instructions instead of failing miserably.

Edit and run this Bash example code

This code is editable and runnable. You can run "Check arguments in your Bash script" by pressing the run button. It will be executed in our backend and the result (stdout and stderr) is displayed in addition tabs.

Share "Check arguments in your Bash script"

Share this crumb (Check arguments in your Bash script) with your friends and colleagues to help them learn more about Bash programming.

Twitter, Facebook, LinkedIn

On Twitter, Facebook, and LinkedIn, simply paste the URL in your post and watch the magic unfold.

IFRAME

If you want to embed the crumb in an iframe, use the following code:

oEmbed (WordPress)

We support oEmbed, but most sites use allowlisting. On WordPress, oEmbed is supported out of the box, but see the note below.

If you plan to use crumb.sh heavily on Wordpress, you can use the following PHP code to allowlist our site and unlock all the functionalities of our crumbs:
wp_oembed_add_provider( 'https://crumb.sh/*', 'https://crumb.sh/oembed/' );

Embed.ly

Embed.ly is a service that allows you to embed content from other sites. We will request to be added to the list of trusted sites once we're out of beta.