git-credential:tldr:2ad09

The command echo "${url=http:--example-com}" | git credential reject is used to reject or invalidate a stored credential entry for a specific URL in Git.

Here's a breakdown of what each part of the command does:

1. echo: This is a command in Unix-like operating systems that prints the given arguments to the terminal or standard output.

2. "${url=http:--example-com}": This sets the environment variable $url to the value http:--example-com. The format ${variable=value} is used to assign a default value to a variable if it is not already set. In this case, if the $url variable is not set, it will be assigned the value http:--example-com. The variable $url typically represents the URL that needs to be rejected.

3. |: This is a pipe operator that connects the output of the echo command to the input of the git credential reject command. It allows the output of one command to be used as input for another command.

4. git credential reject: This is a Git command that rejects a stored credential entry for a given URL. It communicates with the Git credential system, which can store and retrieve credentials (such as usernames and passwords) for different remote repositories.

In summary, this command combines setting a default URL value using echo and rejecting that URL's stored credential entry using git credential reject. It is typically used to discard or invalidate a stored credential for a specific URL in Git.