Repo forall-c usage

1.repo forall Command
 # repo forall-help
 # repo forall-c: This command iterates through all of the git repositories and executes the commands specified by-C at each warehouse, and the commands executed are not limited to git commands, But any command supported by the system, such as: LS, git log, git status, etc.
2.repo forall-c use
  # switch branches
  # repo formal-c git checkout dev_test
  # Delete Branch
  # repo forall-c git branch-d dev_test
  # Discard Branch
  # repo forall-c git git reset-hard commit ID (or most primitive: HEAD) 
 
  # repo forall-r framework/base/core-c git reset-hard commit ID (or most original head)