如何在UNIX中为变量赋值参数？

Question

#!/bin/bash
if [ ! $1 ]
then
 echo "no param"
else
    export FAV_COLOR=$1
    echo "My fav color is ${FAV_COLOR}"
fi

这不符合我的预期:

>favcol.sh blue
My fav color is FAV_COLOR=blue

有什么想法吗？

Answer 1

删除set.

FAV_COLOR=$1
echo "My fav color is ${FAV_COLOR}"

或者,如果要设置它以便在shell中运行的后续程序可用:

export FAV_COLOR=$1
echo "My fav color is ${FAV_COLOR}"

该export关键字被描述得相当好这里.