What is the best method to test if a program exists for a shell script?

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1 answer

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                          I'm just curious to know how to best check if a program exists. I've seen solutions with 

* test
* command
* hash
* type
* which
* [

Which is the best method, is there a *right* answer? What does the POSIX and LSB specs say about this?
                        

Asked by Evan Carroll (34663 rep)

Nov 13, 2017, 03:16 AM
Last activity: Nov 13, 2017, 03:23 AM

What is the best method to test if a program exists for a shell script?

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