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This article introduces the relevant knowledge of "how to use the expr command". Many people will encounter such a dilemma in the operation of actual cases, so let the editor lead you to learn how to deal with these situations. I hope you can read it carefully and be able to achieve something!

The expr command can realize the functions of numerical operation, numeric or string comparison, string matching, string extraction, string length calculation and so on. It also has several special functions to determine whether a variable or parameter is an integer, empty, zero, and so on.

Common operators for expr:

Addition operation: + subtraction operation:-multiplication operation:\ * division operation: / touch (remainder) operation:% syntax expr (option) (parameter) option-- help: display instruction help information;-- version: display instruction version information. Parameter expression: an expression that requires a value. This is the end of the example result= `expr 2 + 3`result = $(expr $no1 + 5) "how to use the expr command". Thank you for reading. If you want to know more about the industry, you can follow the website, the editor will output more high-quality practical articles for you!

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