#!/bin/sh
export SECTION_NUM=100
sh tmp2.sh
export -n SECTION_NUM
echo $SECTION_NUM
sh tmp2.sh
[beyes@beyes shell]$ sh tmp.sh
100
100
#输出一个空行,说明经过 -n 参数后,$SECTION_NUM 失去了 “全局性”,即 tmp2.sh 中不能获得其值,然而在 tmp.sh 中仍然可以获得该值
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