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find . -type f -name '*.txt' -exec sed -i '' s/this/that/ {} +

find . -name "*.java" -exec sed -i "" 's/com.xxx.R/android.R/g' {} \;

grep -nr "@+id" *

find . -name "*.java" | xargs sed -i 's/com.xxx.R/android.R/g'

find . -name "*.xml" | xargs grep -i -n "@id/" >> output.txt

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repo forall -c 'git reset --hard ; git clean -fdx'

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rsync -abP  folder1/src/ folder2/src

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#查看系统信息
cat /etc/issue    cat /proc/verison

top – 进程活动

vmstat -系统活动、硬件及系统信息

w – 显示谁已登录，他们正在做什么？

uptime – 告诉系统已经运行了多久？

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netsh wlan set hostednetwork mode=allow ssid="wifi hotspot name" key="wifi password"

netsh wlan start hostednetwork

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adb logcat -b main -b radio -b events -v time>test.log

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mac 硬盘测速
time dd if=/dev/zero bs=1024k of=tstfile count=1024
time dd if=tstfile bs=1024k of=/dev/null count=1024

显示：defaults write com.apple.finder AppleShowAllFiles -bool true
隐藏：defaults write com.apple.finder AppleShowAllFiles -bool false 

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<?xml version="1.0" encoding="utf-8" ?>
<resources>
  <color name="white">#FFFFFF</color><!--白色 -->
  <color name="ivory">#FFFFF0</color><!--象牙色 -->
  <color name="lightyellow">#FFFFE0</color><!--亮黄色 -->
  <color name="yellow">#FFFF00</color><!--黄色 -->
  <color name="snow">#FFFAFA</color><!--雪白色 -->
  <color name="floralwhite">#FFFAF0</color><!--花白色 -->
  <color name="lemonchiffon">#FFFACD</color><!--柠檬绸色 -->
  <color name="cornsilk">#FFF8DC</color><!--米绸色 -->

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# 批量装文件夹下apk
for f in *.apk ; do adb install -r $f; done; 

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import urllib.request
import asyncio
import json

r = urllib.request.urlopen('https://raw.githubusercontent.com/spacelan/wechat-emoticon/master/emoticons.json').read().decode('utf8')
json_obj = json.loads(r)

@asyncio.coroutine
def download(todo):
  urllib.request.urlretrieve(todo.get('url'), todo.get('md5') + '.gif')