*** ref file: 'ref.txt'
/a
/a/b
/a/b/c
/b
/b/c
/c
/ab
/abc
/abcd

*** bu file: 'full.txt.BU'
CMD="/a/a.sh"
CMD="/aa.sh"
CMD="/ab.sh"
CMD="/abc.sh"
CMD="/a/bc.sh"
CMD="/a/b/c.sh"
CMD="/a/b/c/.sh"
CMD="/a/b/cd.sh"
CMD="/a/b/c/d.sh"
CMD="/x/y.z"
CMD="/a/xyz.sh"
CMD="/abcd.sh"
CMD="/a/very 'special' command.exe"

*** full file: 'full.txt'
CMD="/a/a.sh"
CMD="/a/a.sh"
CMD="/a/b.sh"
QRY(4)="/a/bc.sh"
QRY(4)="/ab/c.sh"
QRY(5)="/a/b/c.sh"
QRY(5)="/a/bc.sh"
CMD="/a/b/c.sh"
WTF(7)="/a/b/c/.sh"
QRY(8)="/a/b/cd.sh"
QRY(8)="/a/b/c/d.sh"
CMD="/a/b/c/d.sh"
WTF(10)="/x/y.z"
CMD="/a/xyz.sh"
QRY(12)="/a/bcd.sh"
QRY(12)="/abc/d.sh"
QRY(12)="/ab/cd.sh"
CMD="/a/very 'special' command.exe"