The UNIX Shell

王朝system·作者佚名  2006-01-09
窄屏简体版  字體: |||超大  

A shell is a text-based interface between the user and the OS, which is a command interpreter that accepts statements (commands) issued by the user through the keyboard, mouse or other devices. A typical multiuser system should provide commands to the tasks which excute and manage programs, manipulate files and obtain system information.

A shell could also be turned to a powerful programming language. This idea was pioneered in the UNIX OS. The following is the code of a simple shell script (OSP by Bic & Shaw) :

COUNT = 'who|wc -l'

if test $COUNT -lt 8

then echo $COUNT users logged in

else echo too many users

fi

 
 
 
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