procps top (and other binaries) coexist with busybox binaries (/bin vs. /usr/bin)
If one installs procps programs like top coexist with the busybox
symlink of top.
This also counts for other programs from procps.
Reason for this: procps installs to /bin but busybox symlinks to
/usr/bin.
Because of this packaging mistake one opens “busybox top” insted of “procps top”. “procps top” still opens correctly if one writes “/bin/top”.
(from redmine: issue id 8494, created on 2018-02-16)