mirror of
https://github.com/dunwu/linux-tutorial.git
synced 2024-04-15 19:55:24 +08:00
30 lines
432 B
Bash
30 lines
432 B
Bash
|
#!/bin/bash
|
||
|
|
# testing string length
|
||
|
|
|
||
|
|
#-n 判断长度是否非零
|
||
|
|
#-z 判断长度是否为零
|
||
|
|
|
||
|
|
val1=testing
|
||
|
|
val2=''
|
||
|
|
|
||
|
|
if [ -n "$val1" ]
|
||
|
|
then
|
||
|
|
echo "The string $val1 is not empty"
|
||
|
|
else
|
||
|
|
echo "The string $val1 is empty"
|
||
|
|
fi
|
||
|
|
|
||
|
|
if [ -z "$val2" ]
|
||
|
|
then
|
||
|
|
echo "The string $val2 is empty"
|
||
|
|
else
|
||
|
|
echo "The string $val2 is not empty"
|
||
|
|
fi
|
||
|
|
if [ -z "$val3" ]
|
||
|
|
then
|
||
|
|
echo "The string $val3 is empty"
|
||
|
|
else
|
||
|
|
echo "The string $val3 is not empty"
|
||
|
|
fi
|
||
|
|
|