Assign error-specific exit codes to constants

sync/server.go

@@ -18,7 +18,7 @@ func GetRemoteDataFromServer(clientDeviceID string) {
 	deletionsList, err := os.ReadDir(core.ConfigDir + core.PathSeparator + "deletions")
 	if err != nil {
 		fmt.Println(core.AnsiError+"Failed to read the deletions directory:", err.Error()+core.AnsiReset)
-		os.Exit(101)
+		os.Exit(core.ErrorRead)
 	}
 
 	// print the current UNIX timestamp to stdout