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Shell Clones and Unix-like Platforms
The proliferation of shells has not stopped at the boundaries of UNIX-dom. Many programmers who got their initial experience on UNIX systems and subsequently crossed over into the PC world wished for a nice UNIX-like environment. It's not surprising then that several UNIX shell-style interfaces to small-computer operating systems have appeared, Bourne shell emulations among them.
In the past several years, not only shell clones have appeared, but entire Unix "environments." Two of them use shells that we've already discussed. Two others provide their own shell reimplementations. Providing lists of major and minor differences is counterproductive. Instead, this section describes each environment in turn (in alphabetical order), along with contact and Internet download information.