| What is Bourne Shell ?

The Bourne shell is a shell, or command-line interpreter, for computer operating systems. The Bourne shell was the default shell for Version 7 Unix. Most Unix-like systems continue to have—which will be the Bourne shell, or a symbolic link or hard link to a compatible shell—even when other shells are used by most users. Developed by Stephen Bourne at Bell Labs, it was a replacement for the Thompson shell, whose executable file had the same name. It was released in 1979 in the Version 7 Unix release distributed to colleges and universities. Although it is used as an interactive command interpreter, it was also intended as a scripting language and contains most of the features that are commonly  considered to produce structured programs.

Features of the original version

Features of the Version 7 UNIX Bourne shell include:

  • Scripts can be invoked as commands by using their filename
  • May be used interactively or non-interactively
  • Allows both synchronous and asynchronous execution of commands
  • Supports input and output redirection and pipelines
  • Provides a set of built-in commands
  • Typeless variables
  • Provides local and global variable scope
  • Scripts do not require compilation before execution

Some of the primary goals of the shell were:

  • To allow shell scripts to be used as filters.
  • To provide programmability including control flow and variables.
  • Control over all input/output file descriptors.
  • Control over signal handling within scripts.
  • No limits on string lengths when interpreting shell scripts.
  • Rationalize and generalize string quoting mechanism.
  • The environment mechanism. This allowed context to be established at startup and provided a way for shell scripts to pass context to sub scripts  without having to use explicit positional parameters.

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