Generally, a shell is a program that executes other programs in response to text commands. A … See more

The first Unix shell was the Thompson shell, sh, written by Ken Thompson at Bell Labs and distributed with Versions 1 through 6 of Unix, from 1971 to 1975. Though rudimentary by modern standards, it introduced … See more

Shells read configuration files in various circumstances. These files usually contain commands for the shell and are executed when loaded; they are usually used to set important variables used to find executable… See more

Variations on the Unix shell concept that don't derive from Bourne shell or C shell include the following:
• es – A functional programming rc-compatible shell written in the mid-1990s.
• Friendly int… See more

• Comparison of command shells
• List of POSIX commands
• Read–eval–print loop
• Restricted shell… See more