Notes




Comments

Post a Comment

Popular posts from this blog

Scripting

Most command-line interpreters support scripting, to various extents. (They are, after all, interpreters of an interpreted programming language, albeit in many cases the language is unique to the particular command-line interpreter.) They will interpret scripts (variously termed shell scripts or batch files) written in the language that they interpret. Some command-line interpreters also incorporate the interpreter engines of other languages, such as REXX, in addition to their own, allowing the executing of scripts, in those languages, directly within the command-line interpreter itself. Conversely, scripting programming languages, in particular those with an eval function (such as REXX, Perl, Python, Ruby or Jython), can be used to implement command-line interpreters and filters. For a few operating systems, most notably DOS, such a command interpreter provides a more flexible command-line interface than the one supplied. In other cases, such a command interpreter can present a highly...
Read more

Anatomy of a shell CLI

Image
This section needs additional citations for verification . Please help improve this article by adding citations to reliable sources. Unsourced material may be challenged and removed. ( July 2015 ) (Learn how and when to remove this template message) The general pattern of an OS command line interface is: Prompt command param1 param2 param3 … paramN Prompt — generated by the program to provide context for the client. Command — provided by the client. Commands are usually one of three classes: Internal commands are recognized and processed by the command line interpreter itself and not dependent upon any external executable file. Included commands run separate executable files generally considered part of the operating environment and always included with the OS. External commands run executable files that are not part of the basic OS, but added by other parties for specific purposes and applications. param1 …paramN — Optional parameters provided by the client. The format and...
Read more

Command-line interface

Image
A command-line interface ( CLI ) processes commands to a computer program in the form of lines of text. The program which handles the interface is called a command-line interpreter or command-line processor . Operating systems implement a command-line interface in a shell for interactive access to operating system functions or services. Such access was primarily provided to users by computer terminals starting in the mid-1960s, and continued to be used throughout the 1970s and 1980s on VAX/VMS, Unix systems and personal computer systems including DOS, CP/M and Apple DOS. Today, many users rely upon graphical user interfaces and menu-driven interactions. However, some programming and maintenance tasks may not have a graphical user interface and may still use a command line. Alternatives to the command line interface include text-based user interface menus (for example, IBM AIX SMIT), keyboard shortcuts, and various desktop metaphors centered on the pointer (usually controlled with a...
Read more