Add diffutils #44

$ dpkg -S $(realpath $(which diff))
diffutils: /usr/bin/diff
$ dpkg -L diffutils | fgrep /bin/
/usr/bin/cmp
/usr/bin/diff
/usr/bin/diff3
/usr/bin/sdiff

PS> "cmp","diff","diff3","sdiff" | % { gcm $_ }
Get-Command: The term 'cmp' is not recognized as a name of a cmdlet, function, script file, or executable program.
Check the spelling of the name, or if a path was included, verify that the path is correct and try again.

CommandType     Name                                               Version    Source
-----------     ----                                               -------    ------
Alias           diff -> Compare-Object
Get-Command: The term 'diff3' is not recognized as a name of a cmdlet, function, script file, or executable program.
Check the spelling of the name, or if a path was included, verify that the path is correct and try again.
Get-Command: The term 'sdiff' is not recognized as a name of a cmdlet, function, script file, or executable program.
Check the spelling of the name, or if a path was included, verify that the path is correct and try again.

Active code page: 65001

C:\>where diff
INFO: Could not find files for the given pattern(s).