Maybe duplicate of #770. I found the shorter way how to get ghost channel.

$ pijul init p1
$ cd p1
$ touch a
$ pijul add a
$ pijul record -am"."
Hash: HOHPFASE6AZLEP4JECIOGK5TZSYRI66JEFXFEOSKAUCT2RF35MEQC
$ echo "2" >> a
$ pijul record -am"."
Hash: 22Y3QAFNYNJBRENY747BHPU5DJQ45L3WCM46RWG47HVSQXQPAPLQC
$ pijul channel switch m1
$ piju channel
  m1
* main
$ pijul apply 22 --channel main
$ pijul channel
  m1
* main
  S2jWxmc4SxdSLWcp15li
$