#!/bin/bash# testing string length#-n 判断长度是否非零#-z 判断长度是否为零val1=testingval2=''if [ -n "$val1" ]then e
#!/bin/bash# testing string length#-n 判断长度是否非零#-z 判断长度是否为零val1=testingval2=''if [ -n "$val1" ]then echo "The string $val1 is not empty"else echo "The string $val1 is empty"fiif [ -z "$val2" ]then echo "The string $val2 is empty"else echo "The string $val2 is not empty"fiif [ -z "$val3" ]then echo "The string $val3 is empty"else echo "The string $val3 is not empty"fi
