|  | This directory used to contain scripted implementations of builtins | 
|  | that have since been rewritten in C. | 
|  |  | 
|  | They have now been removed, but can be retrieved from an older commit | 
|  | that removed them from this directory. | 
|  |  | 
|  | They're interesting for their reference value to any aspiring plumbing | 
|  | users who want to learn how pieces can be fit together, but in many | 
|  | cases have drifted enough from the actual implementations Git uses to | 
|  | be instructive. | 
|  |  | 
|  | Other things that can be useful: | 
|  |  | 
|  | * Some commands such as git-gc wrap other commands, and what they're | 
|  | doing behind the scenes can be seen by running them under | 
|  | GIT_TRACE=1 | 
|  |  | 
|  | * Doing `git log` on paths matching '*--helper.c' will show | 
|  | incremental effort in the direction of moving existing shell | 
|  | scripts to C. |