“which in ruby”: Checking if program exists in $PATH from ruby

Question

my scripts rely heavily on external programs and scripts. I need to be sure that a program I need to call exists. Manually, I\'d check this using \'which\' in the commandlin

Answer 1

There was a GEM called which_rubythat was a pure-Ruby which implementation. It's no longer available.

However, I found this pure-Ruby alternative implementation.