longer than a single git process; e.g., credentials may be stored
in-memory for a few minutes, or indefinitely on disk).
-Each helper is specified by a single string. The string is transformed
-by git into a command to be executed using these rules:
+Each helper is specified by a single string in the configuration
+variable `credential.helper` (and others, see linkgit:../git-config).
+The string is transformed by git into a command to be executed using
1. If the helper string begins with "!", it is considered a shell
snippet, and everything after the "!" becomes the command.