Subject: bug#20794: ignore subdirectory with diff

From: Jeff THUONG <[email-masked]>
Date: Tue, 3 Jan 2017 12:04:06 +0800

One way to ignore a subdirectory is to use "-x <subdirectory name>"

In the following case, you could use "-x a". Note that would also ignore
files named "a" but not files "a.txt"

├── new
│   ├── a
│   ├── a.txt
│   ├── b
│   └── c
└── old
    ├── a
    │   ├── 1
    │   ├── 2
    │   └── 3
    ├── a.txt
    ├── b
    └── c

In case you want to ignore "aa/bb" (i.e. not comparing "old/aa/bb" and
"new/aa/bb"), you need to use "-x bb" so if you wanted to still
compare "new/cc/bb" and "old/cc/bb" you would be out of luck.