qidiff — show the
    differences since the last quilt refresh
The qidiff utility shows the differences
    between the current state of the tree and the last refreshed
    quilt(1)
    patch. It runs “quilt diff” and passes it through
    interdiff(1)
    to show the changes since the last refreshing.
To obtain the location where
    quilt(1)
    stores its patches, the qidiff utility performs the
    following tests:
  - *
 
  - if the 
QUILT_PATCHES environment variable is set,
      its value is used. 
  - *
 
  - if the .quiltrc file is present in the user's home
      directory, it is sourced in a subshell and the value of the
      
QUILT_PATCHES environment variable is used, if
      defined. 
  - *
 
  - otherwise, patches is used as the name of the
      quilt(1)
      patch directory.
 
The qidiff utility exits 0 on
    success, and >0 if an error occurs.
  - $HOME/.quiltrc
 
  - The file sourced (if available) if the
      
QUILT_PATCHES environment variable is not
    set. 
Display the changes made since the last patch refreshing:
qidiff
The qidiff utility was written by
    Peter Pentchev in 2011.
Peter Penchev
    ⟨roam@ringlet.net⟩
  - *
 
  - add some usage information
 
  - *
 
  - support 
-p0 
  - *
 
  - support /dev/stdin alternatives