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                # Linux expr命令 expr命令是一個手工命令行計數器,用于在UNIX/LINUX下求表達式變量的值,一般用于整數值,也可用于字符串。 ### 語法 ``` expr 表達式 ``` **表達式說明:** * 用空格隔開每個項; * 用 / (反斜杠) 放在 shell 特定的字符前面; * 對包含空格和其他特殊字符的字符串要用引號括起來 ### 實例 1、計算字串長度 ``` > expr length “this is a test” 14 ``` 2、抓取字串 ``` > expr substr “this is a test” 3 5 is is ``` 3、抓取第一個字符數字串出現的位置 ``` > expr index "sarasara" a 2 ``` 4、整數運算 ``` > expr 14 % 9 5 > expr 10 + 10 20 > expr 1000 + 900 1900 > expr 30 / 3 / 2 5 > expr 30 /* 3 (使用乘號時,必須用反斜線屏蔽其特定含義。因為shell可能會誤解顯示星號的意義) 90 > expr 30 * 3 expr: Syntax error ```
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