小时代5-perl调用外部命令awk的方法

sele

linux系统的常用小工具awk天生对列操作友好，有时直接在perl中调用awk比写相应的perl脚本要方便有效的多。比如用system插入awk语句：
system(gawk '{print $1}' $filename);
执行该语句，你会发现这行会报错，提示你使用了read-only 的变量$1。
那么，如何处理两种生态系统下的冲突呢？有一个简单的解决办法：
my $i="$1";
system(gawk '{print $i}' $filename);
这样便解决了(g)awk的$1和perl的 内置变量$1的冲突的问题了。

　　



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