Es shell Assignment Help

The es shell is a command line interpreter developed by Byron Rakitzis and Paul Haahr, that uses a scripting language similar to the rc shell of the Plan 9 operating system. It is intended to provide a fully functional programming language as a Unix shell. The bulk of es development occurred in the early 1990s. A paper on an early version of the es shell was presented at the Winter 1993 USENIX conference in San Diego.

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Es shell Programming code

es> x = foo
es>  let (x = bar) {
echo $x
fn lexical { echo $x }
}
bar
es> lexical
bar
es> local (x = baz) {
echo $x
fn dynamic { echo $x }
}
baz
es> dynamic
foo
 

Features of es shell programming language:

• System can be more programmable with exposing its internals to manipulation by the user
• It support a model of programming where code fragments could be treated as just one more form of data.
• Es shell gives users great flexibility in tailoring programming environment.
• It has an exception mechanism which is used for implementing non-structured control flow.