Invoke Zsh commands via a Swift script

Shell.swift

#!/usr/bin/swift

import Foundation

func shell(_ command: String) {
    let task = Process()
    task.launchPath = "/bin/zsh"
    task.arguments = ["-c", command]

    let pipe = Pipe()
    task.standardOutput = pipe
    task.launch()

    let data = pipe.fileHandleForReading.readDataToEndOfFile()
    let output = String(data: data, encoding: .utf8) ?? ""
    print(output)
}

shell("export MY_VAR=123 ; echo $MY_VAR")

// In CLI:
// chmod a+x Shell.swift
// ./Shell.swift