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Check if an apt-get package is installed and then install it if it's not on Linux
...s upon finding that the package is missing, such as simply exiting with an error code.
REQUIRED_PKG="some-package"
PKG_OK=$(dpkg-query -W --showformat='${Status}\n' $REQUIRED_PKG|grep "install ok installed")
echo Checking for $REQUIRED_PKG: $PKG_OK
if [ "" = "$PKG_OK" ]; then
echo "No $REQUIRED_P...
Java dynamic array sizes?
...
answered Oct 30 '09 at 0:05
cletuscletus
562k152152 gold badges873873 silver badges927927 bronze badges
...
How to generate keyboard events in Python?
...pes import wintypes
import time
user32 = ctypes.WinDLL('user32', use_last_error=True)
INPUT_MOUSE = 0
INPUT_KEYBOARD = 1
INPUT_HARDWARE = 2
KEYEVENTF_EXTENDEDKEY = 0x0001
KEYEVENTF_KEYUP = 0x0002
KEYEVENTF_UNICODE = 0x0004
KEYEVENTF_SCANCODE = 0x0008
MAPVK_VK_TO_VSC = 0
# msdn.m...
Install an apk file from command prompt?
...pk
if you have more than one device/emulator connected you will get this error
adb: error: connect failed: more than one device/emulator
- waiting for device - error: more than one device/emulator
to avoid that you can list all devices by below command
adb devices
you will get results l...
find -exec with multiple commands
...
TinkerTinker
7,05011 gold badge1212 silver badges77 bronze badges
...
“二孩”遇上母婴产业 创业者必读的数据干货 - 资讯 - 清泛网 - 专注C/C++...
...其移动电商化进程将继续加快。
母婴健康移动终端成为连接线上与线下资源、随时随地管理孕育健康的主要通道，孕育各阶段的健康服务链逐渐形成。
作为母婴类应用中发展规模较小且增速缓慢的母婴实用工具，在激烈的...
Why do I get AttributeError: 'NoneType' object has no attribute 'something'?
I keep getting an error that says
10 Answers
10
...
Best way to select random rows PostgreSQL
...ll:
SELECT * FROM f_random_sample();
SELECT * FROM f_random_sample(500, 1.05);
You could even make this generic to work for any table: Take the name of the PK column and the table as polymorphic type and use EXECUTE ... But that's beyond the scope of this question. See:
Refactor a PL/pgSQL func...
Is there a command like “watch” or “inotifywait” on the Mac?
...or installing without homebrew don't seem to work any more. make throws an error about not finding a makefile. Fortunately, fswatch is now on MacPorts, so sudo port install fswatch works, for those of us using MacPorts instead of Homebrew.
– coredumperror
Feb 5...
How to edit multi-gigabyte text files? Vim doesn't work =( [closed]
...nd of 2.5GB log file on windows. Opening in gvim resulted in out of memory error when it exceeded 2GB memory allocated. When trying ctrl-c trick, it did stop loading the file into memory but only allowed to see the part of the file that gvim was able to load. So the longer I waited before pressing c...