我有一个非常简单的脚本来读取位于不同目录中的文本文件：
IFS=$'\n' read -d '' -r -a urls < ../dat/urls.txt
从脚本所在的目录中运行脚本时，此方法很好用。/fetch_urls
但是，如果我从用户家或通过cron运行脚本，它将无法解析urls.txt文件。例如
/home/my-user/data-transfer/fetch_urls.sh
它失败并显示：
line 3: ../dat/urls.txt: No such file or directory
有某种方法可以使其正常工作，因此它始终可以正确解析urls.txt文件。还是我必须将urls.txt的位置作为参数传递？
答案 0 :(得分：1)
您的文件是相对于脚本目录的。您可以通过以下方式获得它：
script_dir=$(dirname "$0")
您现在有两种解决方案：
在访问cd之前，先urls.txt到该目录。我个人不这样做，因为它可能会破坏其他相对路径（例如，命令行上给出的路径）
或者更好的是，在该路径的前面加上相对路径：
IFS=$'\n' read -d '' -r -a urls < "$script_dir/../dat/urls.txt"
答案 1 :(得分：0)
首先，您需要解析已启动脚本的/opt/anaconda1anaconda2anaconda3（在您的示例中为class AppDelegate: UIResponder, UIApplicationDelegate, UNUserNotificationCenterDelegate, MessagingDelegate {
var window: UIWindow?
let gcmMessageIDKey = "message_id"
static var DEVICE_ID = String()
var msg_body = ""
var msg_title = ""
func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
UIApplication.shared.statusBarStyle = .lightContent
FirebaseApp.configure()
Messaging.messaging().delegate = self
if #available(iOS 10.0, *) {
// For iOS 10 display notification (sent via APNS)
UNUserNotificationCenter.current().delegate = self
let authOptions: UNAuthorizationOptions = [.alert, .badge, .sound]
UNUserNotificationCenter.current().requestAuthorization(
options: authOptions,
completionHandler: {_, _ in })
} else {
let settings: UIUserNotificationSettings =
UIUserNotificationSettings(types: [.alert, .badge, .sound], categories: nil)
application.registerUserNotificationSettings(settings)
}
application.registerForRemoteNotifications()
return true
}
func connectToFcm() {
Messaging.messaging().shouldEstablishDirectChannel = true
}
func application(_ application: UIApplication, didRegisterForRemoteNotificationsWithDeviceToken deviceToken: Data) {
if let refreshedToken = InstanceID.instanceID().token() {
AppDelegate.DEVICE_ID = refreshedToken
print("*********")
print("InstanceID token: \(refreshedToken)")
print("*********")
}else{
print("Can't get token device")
}
connectToFcm()
}
func application(_ application: UIApplication, didFailToRegisterForRemoteNotificationsWithError error: Error) {
print("Failed to register for remote notifications with error: \(error)")
}
func application(_ application: UIApplication, didReceiveRemoteNotification userInfo: [AnyHashable : Any], fetchCompletionHandler completionHandler: @escaping (UIBackgroundFetchResult) -> Void) {
print(userInfo)
guard let data: [String: Any] = userInfo as? [String: Any] else {
return
}
let listData = data["notification"] as! String
let jsonData = listData.data(using: .utf8)
do {
let decoder = JSONDecoder()
let dataJson = try decoder.decode(DataNotif.self, from: jsonData!)
msg_body = dataJson.body!
msg_title = dataJson.title!
createNotification(title: msg_title, body: msg_body)
}catch{
print("error")
}
completionHandler(UIBackgroundFetchResult.newData)
}
// messaging
func messaging(_ messaging: Messaging, didRefreshRegistrationToken fcmToken: String) {
if let token = InstanceID.instanceID().token() {
AppDelegate.DEVICE_ID = token
print("*********")
print("Token Instance: \(token)")
print("*********")
}
connectToFcm()
}
func messaging(_ messaging: Messaging, didReceive remoteMessage: MessagingRemoteMessage) {
print("Received data message: \(remoteMessage.appData)")
guard let data: [String: Any] = remoteMessage.appData as? [String: Any] else {
return
}
let listData = data as! NSDictionary
let jsonData = listData.data(using: .utf8)
do {
let decoder = JSONDecoder()
let dataJson = try decoder.decode(DataNotif.self, from: jsonData!)
msg_body = dataJson.body!
msg_title = dataJson.title!
createNotification(title: msg_title, body: msg_body)
}catch{
print("error")
}
}
func userNotificationCenter(_ center: UNUserNotificationCenter, willPresent notification: UNNotification, withCompletionHandler completionHandler: @escaping (UNNotificationPresentationOptions) -> Void) {
completionHandler([.alert, .badge, .sound])
}
func applicationDidBecomeActive(_ application: UIApplication) {
UIApplication.shared.applicationIconBadgeNumber = 0
connectToFcm()
}
func application(_ application: UIApplication, performFetchWithCompletionHandler completionHandler: @escaping (UIBackgroundFetchResult) -> Void) {
completionHandler(.newData)
}
func applicationDidEnterBackground(_ application: UIApplication) {
Messaging.messaging().shouldEstablishDirectChannel = false
print("Disconnect FCM")
}
func createNotification(title: String, body: String) {
let content = UNMutableNotificationContent()
content.title = NSString.localizedUserNotificationString(forKey: title, arguments: nil)
content.body = NSString.localizedUserNotificationString(forKey: body, arguments: nil)
content.sound = UNNotificationSound.default
content.badge = NSNumber(integerLiteral: UIApplication.shared.applicationIconBadgeNumber + 1)
let request = UNNotificationRequest.init(identifier: "pushNotif", content: content, trigger: nil)
let center = UNUserNotificationCenter.current()
center.add(request)
}
}
）。
current directory然后，您只需要在脚本中修正行即可：
fetch_urls.sh