评估在awk中作为参数传递的算术表达式 [英] evaluate arithmetic expression passed as argument in awk

问题描述

如何计算在awk中作为参数传递的算术表达式?

How to evaluate arithmetic expression passed as argument in awk?

我有这个文件.

1*2*3
1+2*3

传入此文件后，awk应该输出6、7.

awk should output 6, 7, when this file is passed in.

推荐答案

awk(1)是错误的工具，因为它没有eval()函数.我建议将文件修改为bc(1)的输入或使用shell算术扩展:

awk(1) is the wrong tool as it doesn't have an eval() function. I suggest modifying the file into input for bc(1) or using shell arithmetic expansion:

while read expr; do
    echo "$(($expr))"
done < file

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