Shell compatibility

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"Sensible" Input/Output redirection
Aliases
Builtin artithmetic evaluation
Can avoid user startup files
Can cope with large argument lists
Can specify startup file
Checks Mailbox**
Co Processes
Command history
Command line editing
Custom Prompt (easily)
Directory stack**
Emacs Command line editing
Exceptions
File no clobber ability*
Filename completion
Freely Available*
Full signal trap handling
Fully programmable Completion
Has anonymous functions
Has non-interactive startup file**
Has non-login startup file*
History completion
Hostname completion
Job control
Lexically scoped variables
List Variables
Local variables
Login/Logout watching**
Low level command redefinition
Mh Mailbox completion***
Periodic command execution
Process Substitution
Rebindable Command line editing
Shell functions
Spelling Correction
Sun Keyboard Hack
Tty Sanity Checking
Underlying Syntaxcshshshrcshrccshsh
User name look up
Username completion
Vi Command line editing±