Check if a command is available in your system

type {command} >/dev/null
Usefull to detect if a commad that your script relies upon is properly installed in your box, you can use it as a function function is_program_installed() { type "$1" >/dev/null } Invoke it and check the execution code is_program_installed "dialog" if [ ! $? -eq 0 ]; then echo "dialog is not installed" exit 1 fi
Sample Output
{command} is /usr/bin/{command}

By: h3nr1x
2011-06-22 15:30:57

1 Alternatives + Submit Alt

What Others Think

Useful, but note: the command must be in your PATH for this to work.
flatcap · 581 weeks and 1 day ago
I agree with @flatcap. Also, if it's in your path, you could simply invoke: which This will give you the full path to the binary.
peterRepeater · 576 weeks and 4 days ago
which type prints nothing type type > /dev/null; echo $? prints 0 (which means the command is available) "type {command} >/dev/null" checks for all the commands available, included the built-in ones, "which" only checks for commands in the system-path
h3nr1x · 576 weeks and 4 days ago

What do you think?

Any thoughts on this command? Does it work on your machine? Can you do the same thing with only 14 characters?

You must be signed in to comment.

What's this? is the place to record those command-line gems that you return to again and again. That way others can gain from your CLI wisdom and you from theirs too. All commands can be commented on, discussed and voted up or down.

Share Your Commands

Stay in the loop…

Follow the Tweets.

Every new command is wrapped in a tweet and posted to Twitter. Following the stream is a great way of staying abreast of the latest commands. For the more discerning, there are Twitter accounts for commands that get a minimum of 3 and 10 votes - that way only the great commands get tweeted.


Subscribe to the feeds.

Use your favourite RSS aggregator to stay in touch with the latest commands. There are feeds mirroring the 3 Twitter streams as well as for virtually every other subset (users, tags, functions,…):

Subscribe to the feed for: