一些常用的Linux的命令记录

Common Command

1. 查看当前系统的版本

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cat /etc/issue

2. 查看当前所安装的软件

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dpkg -l

3. 查看某软件安装路径

dpkg -L | grep ftp 查看ftp的位置

• 自动拷贝文件

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@echo off
cls
cd ./bin

REM 打印当前文件夹中的dll名称
dir *.dll

for /r %%j in (*.dll) do (
	REM 拷贝Release版的dll到指定目录
	echo %%j | find "_d" || xcopy %%j E:path\Release\ /Y
	REM 拷贝Debug版的dll到指定目录
	echo %%j | find "_d" && xcopy %%j E:path\Debug\ /Y
)

PAUSE

• 批量自动移动文件并自动建立同名文件夹

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@echo off
REM 首先遍历最外层的文件夹，
for /f  %%i in ('"dir /ad/b/on *.*"') do (  
	echo "First Dir: %%~fi"
	REM MKDIR OF DESTINATION
	md E:\Destination\%%i
	cd %%~fi
    REM 获取到子文件夹之后再递归遍历子文件夹
	for /f  %%j in ('"dir /ad/b/on *.*"') do (  
		echo  "Second Dir:%%~fj"
		REM MKDIR OF DESTINATION
		md E:\Destination\%%i\%%j
		cd %%~fj
		REM 拷贝每个文件到预定的路径中
		for %%k in (*.las) do ( 
			echo "Third Dir:%%~fk"
			REM COPY EACH LAS FILE
			xcopy %%k E:\Destination\%%i\%%j\ /E /D /R /Y
		)
		REM 返回到上层文件夹，继续后续的遍历
		cd ..
	)
	REM 同理
	cd ..
)
REM 脚本运行完之后不退出
pause

bat中的一些语法学习，用于MicroStation多人编译

Parameter Setting

1、系统参数

%SystemRoot% === C:(%windir% 同样)
%ProgramFiles% === C:Files
%USERPROFILE% === C:and Settings(子目录有“桌面”,“开始菜单”,“收藏夹”等)
%APPDATA% === C:and SettingsData
%TEMP% === C:₁1~1(%TEM% 同样)
%APPDATA% === C:and SettingsData
%OS% === Windows_NT (系统)
%Path% === %SystemRoot%;%SystemRoot%;%SystemRoot%(原本的设置)
%HOMEDRIVE% === C: (系统盘)
%HOMEPATH% === and Settings :: 枚举当前的环境变量

OSG中的坐标系和OpenGL中的坐标系

OSG中采用四元数表示旋转：osg::Quat(angle to rotate, rotate around axis);

///***
///Q quaternion * P quaternion means that first conduct a rotation P,Second conduct a rotation Q, means a fusion about two rotations with a multiplication operation ///***

The osg coordinate definition as left-hand coordinate which is right-front-up(x-y-z) and the OpenGL coordinate definition also as left-hand coordinate which is right-up-behind(x-y-z), z axis is pointer to outside the screen The OSG default viewport is along down direction, so heading is rotate to be equal to the y positive direction, rotate axis is x axis

Usage

  Here, i'm trying to sequeeze a normal video to a n times faster. But, i found that there are many ways to relize this, such as

• ffmpeg and adjust the speed while roamming, etc.
  
• OpenCV requires being complied with ffmpeg, which i didn't have the condition and many video format(.mp4) is not well supported.

Installation

• Under Linux

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sudo apt install ffmpeg

• Under Windows

Directly download the binary executable file from the official page. Move to the bin folder and run the ./ffmpeg in command line.

For example the "ffmpeg-master-latest-win64-gpl-shared" file.