shawnfeng0

tmux shortcuts & cheatsheet

start new:

tmux

start new with session name:

tmux new -s myname

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注意：本文内容适用于 Tmux 2.3 及以上的版本，但是绝大部分的特性低版本也都适用，鼠标支持、VI 模式、插件管理在低版本可能会与本文不兼容。

Tmux 快捷键 & 速查表

启动新会话：

tmux [new -s 会话名 -n 窗口名]

恢复会话：

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import android.support.annotation.NonNull;

/**
 * Measuring code runtime.
 * For example:
 *  long timeSpent = TimeMeasure.doTimeMeasureUs(() -> {
 *                 if (!nativeSendFrame(receiverName, videoBufferByte)) {
 *                     if (++mErrorCount >= ERROR_MAX_COUNT) {
 *                         throw new Exception("Send frame error.");
 *                     }

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    /**
     * Is the Android service running?
     * @param context The current context.
     * @param serviceClass The service to get running state.
     * @return true: if service is running.
     */
    static boolean isServiceRunning(Context context, Class<?> serviceClass) {
        ActivityManager manager = (ActivityManager) context.getSystemService(Context.ACTIVITY_SERVICE);
        if (manager == null) return false;
        for (ActivityManager.RunningServiceInfo serviceInfo : manager.getRunningServices(Integer.MAX_VALUE)) {

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public static List<String> getIpAddressString() {
        List<String> result = new ArrayList<>();
        try {
            for (Enumeration<NetworkInterface> enNetI = NetworkInterface
                    .getNetworkInterfaces(); enNetI.hasMoreElements(); ) {
                NetworkInterface netI = enNetI.nextElement();
                if (netI.getDisplayName().matches("wlan(.*)") || netI.getDisplayName().matches("eth(.*)")) {
                    for (Enumeration<InetAddress> enumIpAddr = netI
                            .getInetAddresses(); enumIpAddr.hasMoreElements(); ) {
                        InetAddress inetAddress = enumIpAddr.nextElement();

shawnfeng0

on linux 4.19, I get

error creating new backup file '/var/lib/dpkg/status-old': Invalid cross-device link

when trying to install stuff on a ubuntu docker container. this seems to be an issue with metacopy https://www.spinics.net/lists/linux-unionfs/msg06109.html

issue can be worked around by running

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cmake_minimum_required(VERSION 2.8.4)
project(Ardupilot)

# Function:                 EXCLUDE_FILES_FROM_DIR_IN_LIST
# Description:              Exclude all files from a list under a specific directory.
# Param _InFileList:        Input and returned List
# Param _excludeDirName:    Name of the directory, which shall be ignored.
# Param _verbose:           Print the names of the files handled

FUNCTION (EXCLUDE_FILES_FROM_DIR_IN_LIST _InFileList _excludeDirName _verbose)

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/**
 * Modify some bits within a number
 *
 * @note The lowest index is 0, increasing sequentially
 *
 * @param origin Original data
 * @param offset Offset that needs to be modified
 * @param len Bit length
 * @param value The value to which the specified bit needs to be replaced
 * @return Modified value

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#include <stdint.h>
#include <stdlib.h>

enum BatteryLevel {
  BATTERY_LEVEL_VERY_LOW = 0,
  BATTERY_LEVEL_LOW = 1,
  BATTERY_LEVEL_MEDIUM = 2,
  BATTERY_LEVEL_HIGH = 3,
  BATTERY_LEVEL_VERY_HIGH = 4,
  BATTERY_LEVEL_END = 5

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char *Hex2Str(uint8_t *addr, size_t len, char *out_str, size_t out_str_len,
              bool from_end) {
  if (addr == NULL || len == 0 || out_str == NULL || out_str_len < 3)
    return out_str;
  len = len < (out_str_len-1) / 2 ? len : (out_str_len-1) / 2;

  char hex[] = "0123456789ABCDEF";
  char *str = out_str;