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sh: /usr/bin/lockfile: No such file or directory

sh: /usr/bin/lockfile: No such file or directory in Mac OS X El Capitan explained and fixed.

14 November 2015

Q.

Mysterious error message after updating to El Capitan: sh: /usr/bin/lockfile: No such file or directory

A.

[I]n El Capitan B4, Apple decided to stop shipping Procmail, and with it, lockfile. It wasn’t deprecated and then removed… it was unceremoniously sent to the bit bucket. So, as of B4, scheduling in El Capitan broke.

—Shirt Pocket Watch: Oh yeah? Well, lock *this*!