为什么在做变量比较的时候,老出现如下错误!

linux-root

像如
read a
if [ $a = "abc" ] ;then

./re: line 4: [: a: integer expression expected

寂寞烈火

read a;[[ $a == *abc* ]]&&echo ok||echo error

linux-root

[root@www root]# read a;[[$a=="abc"]]&& echo ok||echo error
abc
bash: [[abc==abc]]: command not found
error

miFor

1. if [ "$a" = "abc" ] ; then

复制代码

这样即使$a为空也不会报错了.

寂寞烈火

Post by linux-root
[root@www root]# read a;[[$a=="abc"]]&& echo ok||echo error
abc
bash: [[abc==abc]]: command not found
error

注意空格....