Describe shell. Name any three Linux shells.
Answers
Description of three Linux shells.
The main purpose of "Shell" in Linux is that, it ptovides an interface through which the User and an Operating System (OS) can
connect. There are mainly 3 types of shells available in LInux:
○ The Bourne Shell: It is the original and most preferred shell for shell programming. It provides much speed and compactness
but laks infeatures for interactive use (like, fetching history). The full path for this shell is: /sbin/sh.
○ The C Shell: It is much more feature-rich shell, consisting of interactive Commands like, History.
The full path for this shell is: /bin/csh.
○ The Korn Shell: It is a kind of a Superset to Bourne Shell, but also consisting of the interactive features. It also arithmetic, arrays,
functions such kind of features. The full path for this shell is: /bin/ksh.
The Bourne Shell, C Shell, and Korn Shell are Linux shells.
Explanation:
A 'Shell' is a program that provides a 'liaison' between the 'user and the operating system' (OS) kernel.
The Bourne Shell
- It is the favorite 'shell programming' because of its speed and compactness.
- It lacks functionality for interactive use, also lacks built-in 'arithmetic and logical expression handling'.
The 'C shell'
- Incorporated 'features for interactive use', like 'aliases and command history'.
- It contains a convenient programming function, like built-in arithmetic and C-like expression syntax.
The Korn shell
- It is a 'superset of the Bourne shell'.
- It has interactive features compare to those in the C shell.
- It has convenient programming features like 'built-in arithmetic' and 'C-like functions', arrays, and 'string-manipulation facilities'.
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