Chapter s Operating System 5.2 Evolution of os function Jobs, programs and processes Note that it is not meaningful to execute a job step unless each of the previous job steps has executed success fully, e.g. linking s not meaningful unless compilation was successful. The notion of a job was important in early computer systems which did not support interactive computing it is of marginal relevance in most contemporary systems, for example the Bat files of Ms dos and shell scripts of Unix resemble the notion of jobs 每一步都要在前一步执行成功后才能执行。比如,除非编译 成功,否则链接就毫无意义。在早期不支持交互计算的计算 机系统中,作业的概念很重要。它在现代系统中也有应用, 如MS-DOS中的Bat文件和Unx中的shel|脚本。 计算机专业英语 5-33Chapter 5 Operating System 计算机专业英语 5-33 Jobs, programs and processes Note that it is not meaningful to execute a job step unless each of the previous job steps has executed success fully, e.g. linking is not meaningful unless compilation was successful. The notion of a job was important in early computer systems which did not support interactive computing it is of marginal relevance in most contemporary systems, for example the BAT files of MS DOS and shell scripts of Unix resemble the notion of jobs. 每一步都要在前一步执行成功后才能执行。比如，除非编译 成功，否则链接就毫无意义。在早期不支持交互计算的计算 机系统中，作业的概念很重要。它在现代系统中也有应用， 如MS-DOS中的Bat文件和Unix中的shell脚本。 5.2 Evolution of OS Function