Legacy UNIX Compatibility

I had a question, so I wrote a post here in the community. When installing Rocky OS, if you look at the options, it says Legacy UNIX Compatibility. Is this the same as Redhat’s Compatibility library? If it’s something else, could you please explain?

The Legacy UNIX Compatibility provides optional packages. Usually the only one that shows up is mksh. It used to have more.

      <packagereq variant="BaseOS" type="optional">mksh</packagereq>
      <packagereq variant="AppStream" type="optional">cups-lpd</packagereq>
      <packagereq variant="AppStream" type="optional">ksh</packagereq>
      <packagereq variant="AppStream" type="optional">ncompress</packagereq>
      <packagereq variant="AppStream" type="optional">telnet</packagereq>
      <packagereq variant="AppStream" type="optional">telnet-server</packagereq>
      <packagereq variant="AppStream" type="optional">tftp</packagereq>
      <packagereq variant="AppStream" type="optional">xinetd</packagereq>
      <packagereq variant="AppStream" type="optional">ypbind</packagereq>
      <packagereq variant="AppStream" type="optional">ypserv</packagereq>

Thanks for your answer. Can I assume that it is different from the compatible library provided by Redhat when installing?

Can you explain what you are referring to about “compatibility library”? The legacy compatibility group does not provide libraries, only applications. Our dnf groups just about match theirs, so it would be helpful to understand what you’re referring to.

Sorry if my explanation was lacking. These are the squares in this picture.
My question is, is the Legacy UNIX Compatibility In Rocky Linux provided here the same as the Compatibility library provided by Cent OS or RedHat?

only One picture is attached, so I’ll write another post.
this is Rocky 8.8

No, they are not the same. Compatibility libraries is not the same as compatibility programs.

The compatibility libraries group (which no longer exists in 8 and up) contained packages like compat-libcap1 and compat-openldap. Legacy UNIX compatibility group is in 7, 8, and 9, and contain legacy programs. In 8 and up, it is currently only mksh.

thanks for your explain

kind of regrads