[Bug 291686] Intrinsic Shell Utilities shouldn't have an executable if it is useless

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=291686

            Bug ID: 291686
           Summary: Intrinsic Shell Utilities shouldn't have an executable
                    if it is useless
           Product: Base System
           Version: Unspecified
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: bin
          Assignee: bugs@FreeBSD.org
          Reporter: nimaje+fbz@bureaucracy.de

There are some useless executables installed on FreeBSD, like alias, bg, cd,
fg, …. These are part of the Intrinsic Utilities [0] as defined by POSIX, as
they only exist to manipulate the *current* shells execution environment and
are useless when spawned on its own. That's a reason why they don't have to be
provided as executables [1]. Only kill is required as an executable.

I haven't checked if another of those intrinsic utilities is useful to have as
executable. But the useless ones should get removed.


[0]:
https://pubs.opengroup.org/onlinepubs/9799919799/utilities/V3_chap01.html#tag_18_07
[1]:
https://pubs.opengroup.org/onlinepubs/9799919799/utilities/V3_chap01.html#tag_18_06

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