You/he needs to have a look at his contract. If he's fixed hours/times then he can appeal, as it were.
If it just says something like 40 hours 5 days out of 7. Then his manager has the right to decide when those hours are allocated. Notice of new shifts would again be in his contract.
By the way. Its etc, as in Et cetera. A Latin expression that means "and other things", or "and so forth"
Not ETC.
HTH