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In computing, a shell is a user interface for access to an operating system's services. In general, operating system shells use either a command-line interface (CLI) or graphical user interface (GUI), depending on a computer's role and particular operation. It is named a shell because it is a layer around the operating system kernel.
In computing, a shell is a user interface for access to an operating system's services. In general, operating system shells use either a command-line interface (CLI) or graphical user interface (GUI), depending on a computer's role and particular operation. It is named a shell because it is a layer around the operating system kernel.


==OS/2 Config.sys information about the Shell==
==OS/2 CONFIG.SYS statements==
 
*PROTSHELL - CONFIG.SYS command to define protected mode shell
*PROTSHELL - CONFIG.SYS command to define protected mode shell
:Example: <code><br> PROTSHELL=C:\OS2\PMSHELL.EXE</code>
:Example: <tt>PROTSHELL=C:\OS2\PMSHELL.EXE</tt>
*SHELL - CONFIG.SYS command to define DOS command interpreter
*SHELL - CONFIG.SYS command to define DOS command interpreter
:Example: <code><br> SHELL=C:\OS2\MDOS\COMMAND.COM C:\OS2\MDOS /P</code>
:Example: <tt>SHELL=C:\OS2\MDOS\COMMAND.COM C:\OS2\MDOS /P</tt>
*OS2_SHELL - Environment variable
*OS2_SHELL - Environment variable
:Example: <code><br> SET OS2_SHELL=C:\OS2\CMD.EXE</code>
:Example: <tt>SET OS2_SHELL=C:\OS2\CMD.EXE</tt>


[[Category:Glossary]]
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Revision as of 22:48, 28 October 2017

In computing, a shell is a user interface for access to an operating system's services. In general, operating system shells use either a command-line interface (CLI) or graphical user interface (GUI), depending on a computer's role and particular operation. It is named a shell because it is a layer around the operating system kernel.

OS/2 CONFIG.SYS statements

  • PROTSHELL - CONFIG.SYS command to define protected mode shell
Example: PROTSHELL=C:\OS2\PMSHELL.EXE
  • SHELL - CONFIG.SYS command to define DOS command interpreter
Example: SHELL=C:\OS2\MDOS\COMMAND.COM C:\OS2\MDOS /P
  • OS2_SHELL - Environment variable
Example: SET OS2_SHELL=C:\OS2\CMD.EXE