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.