mksh

The MirBSD Korn Shell (mksh) — is an actively developed successor of pdksh (Public Domain Korn Shell), aimed at producing a shell good for interactive use, but with the primary focus on scripting.

mksh supports large files, has no limit on array sizes, supports all features of pdksh and some of csh, AT&T ksh, zsh and GNU bash, is compatible with the Bourne shell and POSIX (within limits), and incorporates some other useful builtins and features

mksh can work on most modern Unix-like systems.