find . -type f -exec mv -n "$HOME/"{} "$HOME/"{}"$BACKUP_SUFFIX" \;

[ -f $HOME/"{} ]

find . -type f -exec [ -f $HOME/{} ] && echo {} \;
find: missing argument to `-exec'

find . -type f -exec bash -c  [ -f $HOME/{} ] && echo {} \;

find . -type f -exec test -f "$HOME/"{} \; -exec mv -n "$HOME/"{} "$HOME/"{}"$BACKUP_SUFFIX" \; -exec ln -s "$PWD/"{} "$HOME/"{} \;

\( -exec exec1 \; <mod> -exec exec2 \; \)
<mod> = -a return exec1 AND exec2
<mod> = -b return exec1 OR  exec2

<mod> = empty string == <mod> = -a

$ find .
.
./arch
./arch/install.log

$ find . \( \( -exec test -d {} \; -a -exec sh -c 'echo {}; exit 1' \; \) -o -exec echo {} \; \)
.
.
./arch
./arch
./arch/install.log

Exception in thread "AWT-EventQueue-0" java.lang.IllegalArgumentException: OAuth authorization is required.
	at twitter4j.media.ImageUploadFactory.getInstance(ImageUploadFactory.java:108)
	at twitter4j.media.ImageUploadFactory.getInstance(ImageUploadFactory.java:95)
	at PROJECTPATH.Tweet.PostImage(Tweet.java:83)
	at PROJECTPATH.Tweet.start(Tweet.java:72)
	at PROJECTPATH.PlayingField.keyReleased(PlayingField.java:1055)
...

package PROJECTPATH;

import twitter4j.Twitter;
import twitter4j.TwitterException;
import twitter4j.TwitterFactory;
import twitter4j.auth.AccessToken;
import twitter4j.auth.RequestToken;
import twitter4j.media.ImageUpload;
import twitter4j.media.ImageUploadFactory;
import twitter4j.media.MediaProvider;

import java.io.BufferedReader;
import java.io.File;
import java.io.IOException;
import java.io.InputStreamReader;

/**
 * This class sends a Tweet to Twitter.
 * Escpacially in this case it will tweet a screenshot/media.
 */
public class Tweet {
    // Required Keys for Authentication
    private final static String CONSUMER_KEY = "GEHEIM";
    private final static String CONSUMER_KEY_SECRET = "AUCH GEHEIM";

    /**
     * Start the process
     * @param path
     */
    public Tweet(String path) {
        try {
            start(path);
        } catch (TwitterException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }


    public static void start(String path) throws TwitterException, IOException {

    /**
     * this Method connects with Twitter.com to authorise the programm.
     * @param path
     * @throws TwitterException
     * @throws IOException
     */
        Twitter twitter = new TwitterFactory().getInstance();
        twitter.setOAuthConsumer(CONSUMER_KEY, CONSUMER_KEY_SECRET);
        RequestToken requestToken = twitter.getOAuthRequestToken();
        System.out.println("Autorisierungs-seite: \n" + requestToken.getAuthenticationURL());

        AccessToken accessToken = null;

        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        while (null == accessToken) {
            try {
                System.out.println("Hier PIN eingeben: ");
                String pin = br.readLine();
                accessToken = twitter.getOAuthAccessToken(requestToken, pin);
            } catch (TwitterException te) {
                System.out.println("Fehler beim Zugriff, durch: " + te.getMessage());

                System.out.println("Gebe den PIN erneut ein");
            }
        }

        System.out.println("Zugriffs-Token: " + accessToken.getToken());
        System.out.println("Geheimer Zugriffs-Token: " + accessToken.getTokenSecret());

        PostImage(path);
    }


    /**
     * Screenshot path saved in String
     */

    public static void PostImage(String path) {

        try {
            ImageUpload upload = new ImageUploadFactory().getInstance(MediaProvider.TWITTER);
            String url;
            url = upload.upload(new File(path));
            System.out.println("Successfully uploaded image to Host at " + url);
            System.exit(0);
        } catch (TwitterException te) {
            te.printStackTrace();
            System.out.println("Failed to upload the image: " + te.getMessage());
            System.exit(-1);
        }

    }
}

t.c:6:7: warning: using the result of an assignment as a condition without parentheses [-Wparentheses]
        if(a = 3.0)
           ~~^~~~~
t.c:6:7: note: place parentheses around the assignment to silence this warning
        if(a = 3.0)
             ^
           (      )
t.c:6:7: note: use '==' to turn this assignment into an equality comparison
        if(a = 3.0)
             ^
             ==