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}

2
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 · 433 weeks and 2 days 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 · 428 weeks and 5 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 · 428 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?

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