There have been a variety of UnixShell''''''s for a long time (see QuarterCenturyOfUnix).

During that long time, computers have increased in speed perhaps a millionfold.  What was once way too slow is now done in the blink of an eye.

There are two major command interpreter code forks in Unix: the BourneShell and the CeeShell. Here's an example that will email all your files to someone else:

BourneShell:  /bin/sh, ksh, bash, and others
 address=c2.7.Cspam''''''Garrod@SpamGourmet.com
 export address
 for i in *
 do
	mail -s $i $address <$i
 done
CeeShell:  csh, tcsh, and others
 setenv address c2.7.Cspam''''''Garrod@SpamGourmet.com
 foreach i ( * )
	mail -s $i $address <$i
 end
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CategoryUnix