Counting files in a directory with swift and external processes

fileCountWithPipes.swift

    // Set up the ls process
    let lsProc = Process()
    let lsStdout = Pipe()
    lsProc.launchPath = "/bin/ls"
    lsProc.standardOutput = lsStdout

    // set up the wc process
    let wcProc = Process()
    let wcStdout = Pipe()
    wcProc.launchPath = "/usr/bin/wc"
    wcProc.arguments = ["-l"]
    wcProc.standardInput = lsStdout
    wcProc.standardOutput = wcStdout
    
    // Go!
    lsProc.launch()
    wcProc.launch()
        
    lsProc.waitUntilExit()
    wcProc.waitUntilExit()
    
    // Get the result
    let data = wcStdout.fileHandleForReading.readDataToEndOfFile()
    let stringData = String(data: data, encoding: String.Encoding.utf8)
    
    print("File count = \(stringData?.trimmingCharacters(in: CharacterSet.whitespacesAndNewlines))")