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第三章 标准输入
Chapter 3 Standard Input
Whether it is data for a program to crunch, or simple commands to direct the behavior of a script, input is as fundamental as output. The first part of any program is the beginning of the “input/output” yin and yang of computing.
无论是程序要处理的数据,还是用于指导脚本行为的简单命令,输入都与输出一样重要。任何程序的第一部分都是计算机“输入/输出”阴阳的开始。
译注:作者这里把“输入”和“输出”比作“阴”和“阳”,意即二者相辅相成,不可分割。
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3.1 从文件中获取输入
3.2 …
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3.1 从一个文件中获得输入
3.1 Getting Input from a File
问题
你想让你的 shell 命令从一个文件中读取数据。
解决方案
使用输入重定向,也就是用“<”字符指示的文件中读取数据。
wc < my.file
讨论
就像“>”符号将输出送入一个文件一样,“<”也会从一个文件中得到输入。字符的选择和形状旨在为重定向的内容提供直观的线索。你能看出来么?(思考一下“箭头方向”。)
许多 shell 命令都会使用一个或多个文件名作为参数,但是当没有指定文件名时,则会从标准输入中获取输入。这类命令一般都以 command filename 或 command < filename 的形式调用,得到的结果也相同。这也就是此处 wc 命令的情况,同时也适用于 cat 和其它命令。
这个输入重定向看起来仅像是一个简单的功能,如果你以前使用过DOS命令行就会对…
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SO discussion on how to read from std in stream