mknos
commented
2 months ago - The -M flag is a stub and was included for compatibility; however, version of install from GNU, Solaris[1] and OpenBSD do not support -M
- -M was never mentioned in the usage string or SYNOPSIS but it can be removed entirely
- NetBSD install has -M but it takes a value, so would not be compatible with this stub
- https://shrubbery.net/solaris9ab/SUNWaman/hman1b/install.1b.html