Drop Caches Shell (Ubuntu 20.04)

dropCaches.swift

#!/usr/bin/env swift
import Foundation

// Drops caches if (freeRam / totalRam) < 0.2

print("Program started")
let pipe = Pipe()
let free = Process()
free.executableURL = URL(fileURLWithPath: "/usr/bin/env")
free.arguments = ["free"]
free.standardOutput = pipe
do {
    try free.run()
    free.waitUntilExit()
    print("Got `free` info")
    let data = pipe.fileHandleForReading.readDataToEndOfFile()
    if let output = String(data: data, encoding: String.Encoding.utf8) {
        print("`free` said:", output, separator: "\n")
        let comps = output
            .replacingOccurrences(of: "\n", with: " ")
            .components(separatedBy: " ")
            .filter({ !$0.isEmpty })
        if let totalRam = Double(comps[7]), let freeRam = Double(comps[9]) {
            let ratio = freeRam / totalRam
            if ratio < 0.2 {
                print("Will try to drop caches; Total: \(totalRam), Free: \(freeRam), Ratio: \(ratio)")
                let pipe = Pipe()
                let dropCaches = Process()
                dropCaches.executableURL = URL(fileURLWithPath: "/usr/bin/env")
                dropCaches.arguments = ["bash", "-c", String(format: "%@", ("echo 1 | sudo tee /proc/sys/vm/drop_caches" as! CVarArg))]
                dropCaches.standardOutput = pipe
                do {
                    try dropCaches.run()
                    dropCaches.waitUntilExit()
                    let data = pipe.fileHandleForReading.readDataToEndOfFile()
                    if let dropOutput = String(data: data, encoding: String.Encoding.utf8) {
                        if dropOutput.replacingOccurrences(of: " ", with: "")
                            .replacingOccurrences(of: "\n", with: "") == "1" {
                            print("Dropping process was successful")
                        } else {
                            print("Cannot confirm that the dropping process was successful;"
                                    + " process output: \(dropOutput.debugDescription)")
                        }
                    } else {
                        print("Caches drop process output was not a valid UTF8 String;"
                                + " Cannot confirm that the dropping process was successful")
                    }
                } catch {
                    print("Could not drop caches with the following error: \(error)")
                }
            } else {
                print("Ram looking good; Total: \(totalRam), Free: \(freeRam), Ratio: \(ratio)")
            }
        } else {
            print("Could not parse the output: \(output.debugDescription)")
        }
    } else {
        print("`free` command answer is not a valid UTF String")
    }
} catch {
    print("`free` command failed with following error: \(error)")
}

print("Program ended")