Esh (Unix)
Encyclopedia
The easy shell is a simple and lightweight Unix shell
Unix shell
A Unix shell is a command-line interpreter or shell that provides a traditional user interface for the Unix operating system and for Unix-like systems...

 for Unix-like
Unix-like
A Unix-like operating system is one that behaves in a manner similar to a Unix system, while not necessarily conforming to or being certified to any version of the Single UNIX Specification....

 computer
Computer
A computer is a programmable machine designed to sequentially and automatically carry out a sequence of arithmetic or logical operations. The particular sequence of operations can be changed readily, allowing the computer to solve more than one kind of problem...

 operating systems. Its syntax deviates completely from that of traditional shells, using instead a Lisp-like syntax. Shell script
Shell script
A shell script is a script written for the shell, or command line interpreter, of an operating system. It is often considered a simple domain-specific programming language...

s written for the easy shell tend to have a smaller code size than their traditional shell equivalents, and at the same time provides for a small memory footprint while remaining flexible and programmable.
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