How Can I Find the Path of a Go Executable?

Finding the Path to an Executable

In Go, compiling a program for different platforms allows it to be executed using a relative path or simply its name if it is present in the PATH environment variable. This raises the question of how to determine the exact location of the executable.

One approach is to examine os.Args[0] and seek any extra information beyond the program's name. If it exists, you can use filepath.Abs to get the absolute path. However, for Go versions 1.8 and above, a more straightforward solution is available.

os.Executable: Finding the Executable's Path

Go provides the os.Executable function specifically designed to determine the path of the running executable program. Its usage is simple:

import (
    "os"
    "path"
    "log"
)

func main() {
    ex, err := os.Executable()
    if err != nil { log.Fatal(err) }
    dir := path.Dir(ex)
    log.Print(dir)
}

By executing this code, you obtain the absolute path to the program's directory, which in turn contains the executable.

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