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The Bourne shell (sh) is a shell command-line interpreter for computer operating systems. It first appeared on Version 7 Unix , as its default shell . 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.
Bash can execute the vast majority of Bourne shell scripts without modification, with the exception of Bourne shell scripts stumbling into fringe syntax behavior interpreted differently in Bash or attempting to run a system command matching a newer Bash builtin, etc. Bash command syntax includes ideas drawn from the Korn Shell (ksh) and the C ...
The PWB shell, written by John R. Mashey, which preceded Steve Bourne's Bourne shell; The restricted shell (rsh), an option of the PWB shell, used to create widely-available logins for status-checking, trouble-reporting, but made safe by restricting commands; The troff-mm (memorandum) macro package, written by John R. Mashey and Dale W. Smith
In addition, the shell's command-searching was enhanced to allow shell procedures to be invoked like binary commands, i.e., if the shell found a non-binary file marked executable, it would fork another shell instance to read that file as a shell script. Thus people could type command arguments rather than sh pathname/command arguments.
The Z shell (Zsh) is a Unix shell that can be used as an interactive login shell and as a command interpreter for shell scripting. Zsh is an extended Bourne shell with many improvements, including some features of Bash, ksh, and tcsh. Zsh was created by Paul Falstad in 1990 while he was a student at Princeton University.
MKS Toolkit is a software package produced and maintained by PTC that provides a Unix-like environment for scripting, connectivity and porting Unix and Linux software to Microsoft Windows. It was originally created for MS-DOS , and OS/2 versions were released up to version 4.4. [ 1 ]
He developed Korn shell in response to problems he and his colleagues had with the most commonly used shells at the time, Bourne shell and C shell. The Korn shell pioneered the practice of consultative user interface design, with input from Unix shell users, and from mathematical and cognitive psychologists.
The type command was a shell builtin for Bourne shell that was introduced in AT&T's System V Release 2 (SVR2) in 1984, [3] and continues to be included in many other POSIX-compatible shells such as Bash. However, type is not part of the POSIX standard. With a POSIX shell, similar behavior is retrieved with command -V name