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jamf/Subprocess 2.1.0
Swift library for macOS providing interfaces for both synchronous and asynchronous process execution
⭐️ 22
🕓 36 weeks ago
.package(url: "https://github.com/jamf/Subprocess.git", from: "2.1.0")


License Build CocoaPods Platform Language Carthage compatible SwiftPM compatible Documentation

Subprocess is a Swift library for macOS providing interfaces for both synchronous and asynchronous process execution. SubprocessMocks can be used in unit tests for quick and highly customizable mocking and verification of Subprocess usage.

Full Documentation


Shell Class

The Shell class can be used for synchronous command execution.

Command Input

Input for data
let inputData: Data = ...
let data = try Shell(["/usr/bin/grep", "Hello"]).exec(input: .data(inputData))
Input for text
let data = try Shell(["/usr/bin/grep", "Hello"]).exec(input: .text("Hello world"))
Input for file URL
let url = URL(fileURLWithPath: "/path/to/input/file")
let data = try Shell(["/usr/bin/grep", "foo"]).exec(input: .file(url: url))
Input for file path
let data = try Shell(["/usr/bin/grep", "foo"]).exec(input: .file(path: "/path/to/input/file"))

Command Output

Output as Data
let data = try Shell(["/usr/bin/sw_vers"]).exec()
Output as String
let text = try Shell(["/usr/bin/sw_vers"]).exec(encoding: .utf8)
Output as JSON (Array or Dictionary)
let command = ["/usr/bin/log", "show", "--style", "json", "--last", "5m"]
let logs: [[String: Any]] = try Shell(command).execJSON())
Output as decodable object from JSON
struct LogMessage: Codable {
    var subsystem: String
    var category: String
    var machTimestamp: UInt64
let command = ["/usr/bin/log", "show", "--style", "json", "--last", "5m"]
let logs: [LogMessage] = try Shell(command).exec(decoder: JSONDecoder())
Output as Property List (Array or Dictionary)
let command = ["/bin/cat", "/System/Library/CoreServices/SystemVersion.plist"]
let dictionary: [String: Any] = try Shell(command).execPropertyList())
Output as decodable object from Property List
struct SystemVersion: Codable {
    enum CodingKeys: String, CodingKey {
        case version = "ProductVersion"
    var version: String
let command = ["/bin/cat", "/System/Library/CoreServices/SystemVersion.plist"]
let result: SystemVersion = try Shell(command).exec(decoder: PropertyListDecoder())
Output mapped to other type
let enabled = try Shell(["csrutil", "status"]).exec(encoding: .utf8) { _, txt in txt.contains("enabled") }
Output options
let command: [String] = ...
let errorText = try Shell(command).exec(options: .stderr, encoding: .utf8)
let outputText = try Shell(command).exec(options: .stdout, encoding: .utf8)
let combinedData = try Shell(command).exec(options: .combined)

Subprocess Class

The Subprocess class can be used for asynchronous command execution.

Handling output as it is read
let command: [String] = ...
let process = Subprocess(command)

// The outputHandler and errorHandler are invoked serially
try process.launch(outputHandler: { data in
    // Handle new data read from stdout
}, errorHandler: { data in
    // Handle new data read from stderr
}, terminationHandler: { process in
    // Handle process termination, all scheduled calls to
    // the outputHandler and errorHandler are guaranteed to
    // have completed.
Handling output on termination
let command: [String] = ...
let process = Subprocess(command)

try process.launch { (process, outputData, errorData) in
    if process.exitCode == 0 {
        // Do something with output data
    } else {
        // Handle failure



dependencies: [
	.package(url: "https://github.com/jamf/Subprocess.git", from: "1.0.0")


pod 'Subprocess'


github 'jamf/Subprocess'


Stars: 22
Last commit: 2 weeks ago
jonrohan Something's broken? Yell at me @ptrpavlik. Praise and feedback (and money) is also welcome.

Related Packages

Release Notes

Update exitedWithNonZeroStatus error
1 year ago


  • Breaking: added the output of the command to Shell's exception exitedWithNonZeroStatus error to better conform to objc interop and NSError
  • Updated minimum deployment target to macOS 10.13.

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