awk零碎1【每日一译】--2013-02-01-优快云博客

本文介绍AWK中变量的使用方式，包括默认初始化为空值的特点及如何根据位置进行赋值。此外还讲解了如何通过ARGV数组获取命令行参数。

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Variables in awk can be assigned either numeric or string values. By default, variables are

initialized to the null string, which is eff ectively zero if converted to a number. There is no need
to \initialize" each variable explicitly in awk, the way you would in C or most other traditional
languages.

译：在AWK中变量可被赋予或者是数字或者是字符串的值。默认是被赋予为空值，如果空串被转

为数为数字它将为0.不需要明确去初始化在AWK中的变量值，而在C或者大多数其它传统语方它是

需要的。

Otherwise, the variable assignment is performed at a time determined by its position among the
input file arguments: after the processing of the preceding input fi le argument. For example:
awk '{ print $n }' n=4 inventory-shipped n=2 BBS-list

译：同样的，变量的赋值执行取决于在输入文件参数中它所属的位置：在之前输入文件处理参数

的后面。比如

awk '{ print $n }' n=4 inventory-shipped n=2 BBS-list

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Command line arguments are made available for explicit examination by the awk program in an
array named ARGV

译：ARGC是等待输入参数的个数,ARGV是参数存储的数组；

命令行参数经过AWK的实际测试的可用的，它存储于一个数组名字叫作ARGV;

[oracle@localhost ~]$ awk ' BEGIN{
for (i=0;i<ARGC;i++)
print ARGV[i]}' tmpdata2 tmpdata1

--output---
awk
tmpdata2
tmpdata1