ksh bugs

[Guy Harris]

 >As I understand it, the capabilities of the korn shell that make it run
 >some shell commands (and command files) faster is that it has more built-ins
 >than the standard shell.  For example the korn shell has a built-in for
 >the echo command, built-in math operators and other such stuff.

"echo" (and "test") have been built into the Bourne shell since at least
S5R2, and possibly since S3.  Math operators haven't been built into any
AT&T-distributed Bourne shell, though.