Does not have a goto facility, so code restructuring may be necessary.Scripts do not require compilation before execution.Provides local and global variable scope.Provides flow control constructs, quotation facilities, and functions.Supports input and output redirection and pipelines.Allows both synchronous and asynchronous execution of commands.May be used interactively or non-interactively.Scripts can be invoked as commands by using their filename.This allowed context to be established at startup and provided a way for shell scripts to pass context to sub scripts ( processes) without having to use explicit positional parameters.įeatures of the original version įeatures of the Version 7 UNIX Bourne shell include: Rationalize and generalize string quoting mechanism.No limits on string lengths when interpreting shell scripts.Control over signal handling within scripts.Control over all input/output file descriptors.To provide programmability including control flow and variables.To allow shell scripts to be used as filters.Some of the primary goals of the shell were:
First appearing in Version 7 Unix, the Bourne shell superseded the Mashey shell.
Work on the Bourne shell initially started in 1976. Version 7 Unix: the original Bourne shell manual page. It gained popularity with the publication of The Unix Programming Environment by Brian Kernighan and Rob Pike-the first commercially published book that presented the shell as a programming language in a tutorial form. 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.
It was released in 1979 in the Version 7 Unix release distributed to colleges and universities.
Unix-like systems continue to have /bin/sh-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.ĭeveloped by Stephen Bourne at Bell Labs, it was a replacement for the Thompson shell, whose executable file had the same name- sh. The Bourne shell was the default shell for Version 7 Unix. The Bourne shell ( sh) is a shell command-line interpreter for computer operating systems. Bourne shell interaction on Version 7 Unix
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