The shell is both a command language and a programming language that provides an interface to the UNIX operating system (Bourne, 1978).
The shell is the part of the operating system that the user interacts with, and is arguably the most important part of the operating system. Files can be created, renamed, moved and read from the shell. Computer hardware can be installed, used and removed through the shells. Program applications and scripting can be written, compiled, and ran through the shell.
The mini shell program is used in Unix as a programming software. It is a redirected and streamlined approach at creating variables, commands, and tokens.
interactive interpreter more like a "shell" (if you're a unix person).
API [Application Programming Interface]
There is no "default" Unix shell. Different Unix vendors shipped different shells.
Advanced Programming in the Unix Environment was created in 1992.
KSH is an abbreviation for korn shell. Korn shell is a command interpreter for the Unix programming language. It was written in 1983 by David Korn at Bell Labs.
UNIX was programmed in C.
Unix was created first. The C programming language was created for Unix.
The first shell was 'sh', the Bourne Shell
A Unix shell can be obtained in Cygwin, a Unix compatibility layer used to compile Unix programs and run them on Windows. Microsoft also makes a shell known as "Windows PowerShell" which incorporates more Unix-like features than the standard command prompt.
The a default Unix shell is the shell that comes with and is activated initially with your distribution of Unix. The shell is essentially the program the runs the command line interface allowing someone to interact with their computer. Some examples are the Bourne-Again shell (bash) or the Bourne shell (sh).
The Korn shell.