The major reason is for compatibility. Evidently, Apple didn't see a need for the full functionality of ncal, and only preinstalled it with its backward compatible name, "cal". The sillies.

You also see symlinks doing the same job, as delivered by the vendor. *EL4 has symlinks from /bin/egrep and /bin/fgrep to /bin/grep; in this case, the man page is the same too.

(How apt that "ln" was used in this hint -- "ln" is yet another hardlink to the inode referenced by "cp" and "mv". This is why the "source" and "destination" for "ln" seem to be the wrong way round.)

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