Go Exec

Conveniently shell out from Golang. Many libraries for executing commands in go are about more fine-grained control of subprocesses. This library is not that. This library is for conveniently mimicking the command line from go in more scripting and command-line tooling applications.

This introduces a type Cmd that wraps the built-in Command type.

Examples

Run a command and capture output:

c := exec.Command("echo", "Hello, World!").Run()
if c.IsError() {
    fmt.Println(c.Error())
    fmt.Println(c.ProcessState.ExitCode())
}
fmt.Printf("out: '%s'\n", c.Out())
fmt.Printf("err: '%s'\n\n", c.Err())

Run a command in the foreground:

c := exec.Command("echo", "Hello, World!").RunFg()
fmt.Println(c.IsError())

Change directories in a scope:

exec.Command("pwd").RunFg()
exec.WithTempdir("", "", func() error {
    exec.Command("pwd").RunFg()
    return nil
})
exec.Command("pwd").RunFg()

Piping commands one into another

p := exec.Pipe(
    exec.Command("echo", "aabba\naba\nabbaa"),
    exec.Command("cat"),
    exec.Command("grep", "abb"),
)
p = p.Pipe(
    exec.Command("grep", "aa$"),
)

c = p.RunFg()

Baking commands:

echo := exec.Command("echo").Bake()
echo = echo("again").Bake()
echo("and again!!").RunFg()

wreed4/go-exec

Go Exec

Examples