Let’s talk about some settings and operations of golang

After the program is written in the Golang language, it needs to be set up and run, which includes some operations that interact with the operating system.

1. Compile

In Golang, you need to execute the following instructions when compiling:

go build

This instruction will compile the main package into an executable file and create it in the current directory.

You can also use the go install command to install the compiled executable file in the $GOPATH/bin directory or the $GOBIN directory (the $GOBIN directory needs to be set in the environment variable set up).

2. Cross-compilation

If you need to run Golang programs on other system platforms, you need to cross-compile. Cross-compiling refers to compiling a program into a binary file that can run on other operating systems.

Cross compilation is very simple, you only need to set the two environment variables GOOS and GOARCH during compilation. For example, the following is an example of compiling a Mac version executable file under Linux:

GOOS=darwin GOARCH=amd64 go build

3. Environment variables

Golang supports setting environment variables to affect the running of the program. The following are some commonly used environment variables:

1. GOPATH: Set the location of the Golang workspace directory (workspace). This directory contains all Golang source code, libraries and executable files.
2. GOBIN: Set the default storage path for Golang executable files.
3. GOROOT: Set the installation directory of Golang.

4. Running parameters and flags

In Golang, the program can receive parameters and flags (flag) to affect the operation. The following is an example of a program that passes name and age through parameters:

package main

import (
    "flag"
    "fmt"
)

func main() {
    var name string
    var age int

    flag.StringVar(&name, "name", "", "姓名")
    flag.IntVar(&age, "age", 0, "年龄")
    flag.Parse()

    fmt.Printf("你好，我叫%s，今年%d岁", name, age)
}

You can pass parameters like this during runtime:

./example -name=张三 -age=18

The output result is:

你好，我叫张三，今年18岁

Pass parameters It is very convenient to pass data with and flags, and different judgments and processing can be performed in the code. Especially when writing network services, parameters such as IP and port can be passed in a similar way.

5. Conclusion

The above is a brief introduction to Golang settings and operations. Of course, this is far from the most comprehensive. The operation settings of Golang language are very powerful, and also include version control. , dependency management and other various settings. It is recommended that you use Golang more in your daily work and have the opportunity to gain in-depth knowledge of its operating settings so that you can better deal with various scenarios.

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