Command-line interpreter (shells) can be understood as follows
One of the most essential system programs for an operating system is the command interpreter, which is interface (communicating device) between the user and operating system. Its basic purpose is to read user commands and then try to execute them. Some operating systems comprises of the command interpreter in the kernel. Other operating systems (such as UNIX, Linux, and DOS) treat it as a special program which runs when a job is initiated or when a user first logs on (on the time sharing systems). This program is called the command-line interpreter and is generally known as the shell. Its function is easy to get the next command statement and then execute it. Some of the famous shells for the UNIX and Linux are
Bourne shell (sh), C shell (csh), Bourne Again shell (bash), TC shell (tcsh), and Korn shell (ksh). You can make use of any of these shells by running the corresponding command, listed in the parentheses for each of the shell. Therefore, you may run the Bourne Again shell by running the bash or /usr/bin/bash command.
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