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📜  检查 bash 变量是否未定义 - Shell-Bash 代码示例

📅  最后修改于: 2022-03-11 14:50:07.139000             🧑  作者: Mango

代码示例1
if test -z "$var" 
then
      echo "\$var is empty"
else
      echo "\$var is NOT empty"
fi