KSH 怎么判断一个变量是空值呢？？？急救

dongchun

KSH 怎么判断一个变量是空值呢？？？急救

vantien

1. 
   
2. if [ -z "$var" ]; then
   
3.    echo "Null String"
   
4. else
   
5.    echo "$var"
   
6. fi
   
7. 
   
8. #or use: if [ "$var" = "" ]; then ......
   
9. 
   

复制代码

banhao

if [ $VAR ]
then
echo "NOT NULL"
else
echo "NULL"
fi