How to Find a Yum Package

當要安裝一套library，可能不只要安裝64 bits版本，也需要安裝32 bits版本時，這個功能就很重要，可以查一下這套library的每種版本的名稱，以方便安裝。譬如說要安裝MyQL；

[root@]#yum search mysql

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=========================================== N/S Matched: mysql ===========================================
MySQL-python.x86_64 : An interface to MySQL
apr-util-mysql.x86_64 : APR utility library MySQL DBD driver
bacula-director-mysql.x86_64 : Bacula Director with MySQL database support
bacula-storage-mysql.x86_64 : MySQL Bacula storage daemon files
dovecot-mysql.x86_64 : MySQL back end for dovecot
freeradius-mysql.x86_64 : MySQL support for freeradius
libdbi-dbd-mysql.x86_64 : MySQL plugin for libdbi
mod_auth_mysql.x86_64 : Basic authentication for the Apache web server using a MySQL database
mysql.x86_64 : MySQL client programs and shared libraries
mysql-bench.x86_64 : MySQL benchmark scripts and data
mysql-connector-java.noarch : Official JDBC driver for MySQL
mysql-connector-odbc.x86_64 : ODBC driver for MySQL
mysql-devel.i686 : Files for development of MySQL applications
mysql-devel.x86_64 : Files for development of MySQL applications
mysql-embedded.i686 : MySQL as an embeddable library
mysql-embedded.x86_64 : MySQL as an embeddable library
mysql-embedded-devel.i686 : Development files for MySQL as an embeddable library
mysql-embedded-devel.x86_64 : Development files for MySQL as an embeddable library
mysql-libs.i686 : The shared libraries required for MySQL clients
mysql-libs.x86_64 : The shared libraries required for MySQL clients
mysql-server.x86_64 : The MySQL server and related files
mysql-test.x86_64 : The test suite distributed with MySQL
perl-DBD-MySQL.x86_64 : A MySQL interface for perl
php-mysql.x86_64 : A module for PHP applications that use MySQL databases
qt-mysql.i686 : MySQL driver for Qt's SQL classes
qt-mysql.x86_64 : MySQL driver for Qt's SQL classes
qt3-MySQL.i686 : MySQL drivers for Qt 3's SQL classes
qt3-MySQL.x86_64 : MySQL drivers for Qt 3's SQL classes
rsyslog-mysql.x86_64 : MySQL support for rsyslog

  Name and summary matches only, use "search all" for everything.

就可以獲得完整的資訊，接下來就可以選擇要安裝的版本啦!!!!

[root@]#yum -y install mysql-libs.i686

跨平台C++程式小筆記

1. 具備前後關係的container，會傳回下一個有效的iterator
std::vector
   std::deque
   std::list
   請用 i = abc.erase(i);
   
   不具備前後關係的container，則透過post operator來處理
   std::map
   std:multimap
   std::set
   std:: multiset
   abc.erase(i++);
   
   
   參考網址
   http://stackoverflow.com/questions/433164/what-happens-to-an-stl-iterator-after-erasing-it-in-vs-unix-linux
2. 盡可能的專案底下的*.cpp與*.h檔案，必須與.vcproj 檔案放在同一層，範例如下。
   
   
   D:\Project\aaa.vcproj
   D:\Project\aaa.h
   D:\Project\aaa.cpp
   
   
   不要再多一層目錄來存放*.h與*.cpp。
3. gcc的compiler不認識將字串轉成寬字元的前導字元L，所以各位如何有需要將中文字寫進程式碼內的需求的話，請使用讀檔的方式。
   
   
   wchar_t wc = L’我 ’; è error!!!!

CentOS 6.x上面安裝gcc 4.7

因為我的C++程式需要用到較新的gcc版本，所以就來研究一下怎麼從無到有的來安裝gcc4.7；雖然官方都有提供下載路徑，但是重點在於configure的設定，經過一番測試，只需要依序執行以下的指令，gcc 4.7就從下載到建置到安裝一口氣完成，缺點是必須要等待你的機器做完這些事情，反正是新裝機嘛~~就讓它跑一下吧!!!

64位元版
yum -y install glibc-devel.i686 glibc-devel
sudo yum install glibc-static libstdc++-static
wget http://ftp.gnu.org/gnu/gcc/gcc-4.7.0/gcc-4.7.0.tar.gz
tar xzf gcc-4.7.0.tar.gz
cd gcc-4.7.0
./contrib/download_prerequisites
cd ..
mkdir build_gcc4.7
cd build_gcc4.7
../gcc-4.7.0/configure --prefix=$HOME/.local --enable-languages=c,c++ --disable-multilib --enable-checking=release --enable-bootstrap  --build=x86-centos-linux 
make -j4
make install

32位元版
yum -y install glibc-devel.i686 glibc-devel
sudo yum install glibc-static libstdc++-static
wget http://ftp.gnu.org/gnu/gcc/gcc-4.7.0/gcc-4.7.0.tar.gz
tar xzf gcc-4.7.0.tar.gz 
cd gcc-4.7.0 
./contrib/download_prerequisites 
cd .. 
mkdir build_gcc4.7
cd build_gcc4.7
../gcc-4.7.0/configure --prefix=$HOME/.local --enable-languages=c,c++ --disable-multilib --enable-checking=release --enable-bootstrap --host=i686-linux-gnu --build=i686-linux-gnu
make -j4
make install

DOS指令 不需要寫死路徑

DOS指令 不需要寫死路徑

REM %CD%意指目前目錄
echo %CD%
REM %~dp0意指目前BATCH檔案的目錄
echo Script dir = %~dp0
REM %0意指目前BATCH檔案的目錄及檔名
echo Batch path = %0
REM %1意指目前的引數
echo User argument 1 = %1
Set ScriptDir=%~dp0
REM /D代表切換到那個磁碟機的目錄
CD /D %ScriptDir%