Unary operator expected

Problem: Write the script execution when an error occurs, as follows

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Analysis:

(1) Where the script appears if [$result-eq 0];then

(2) Error unary operator expected the Chinese means that a unary operator should be used, that is, this $result if

is empty then it becomes if [-eq 0], the system will be considered to be one less parameter, only one-eq 0, no left argument,

Therefore, the above error will occur

Workaround: You can change the script to if [[$result-eq 0]];then, add a pair of [] numbers. As for why, I am also Baidu's

This article is from the "Court of the Odd Tree" blog, please be sure to keep this source http://zhangdl.blog.51cto.com/11050780/1850986

Unary operator expected