shell脚本报错:"[: =: unary operator expected"
2017-11-24 12:47
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在匹配字符串相等时,我用了类似这样的语句:
在运行时出现了
究其原因,是因为:
如果变量STATUS值为空,那么就成了 [ = “OK”] ,显然 [ 和 “OK” 不相等并且缺少了 [ 符号,所以报了这样的错误。
当然不总是出错,如果变量STATUS值不为空,程序就正常了。
while [ $cursor != "null" ] do ... done
在运行时出现了
[: =: unary operator expected的错误,尝试了删除等号两侧的空格和括号里的空格都不管用,把语句改成这样就不会出错了:
while [ "$cursor"x != "null"x ] do ... done
究其原因,是因为:
如果变量STATUS值为空,那么就成了 [ = “OK”] ,显然 [ 和 “OK” 不相等并且缺少了 [ 符号,所以报了这样的错误。
当然不总是出错,如果变量STATUS值不为空,程序就正常了。
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