Bashrc 到底是作什麼的 ？

.bashrc 是用來給用戶提供方便的。將你經常使用的packages引援到bashrc裏面，這樣每次打開一個新的Terminal的時候，他就知道你的東西都在哪裏了。有點相似於一個快捷方式的列表。

The name ROS_PACKAGE_PATH is a environment varaible name. The {ROS_PACKAGE_PATH} is the name itself, this basiclly means x = PATH + x, which adds the new path to the old. The colounm : is used to separet two paths.

export ROS_PACKAGE_PATH=~/ros_workspace:/home/peng/octomapLib/alufr-ros-pkg/:${ROS_PACKAGE_PATH}

你能夠用這個簡單的命令把源添加到Bashrc裏面:

source /opt/ros/hydro/setup.bash

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舉個簡單的例子，這個是我電腦裏的 .bashrc：
注意 alias 等號後面不能有空格

$ subl ~/.bashrc

alias mathome='cd /home/mfeng/Matlab-Tests/'
source /opt/ros/hydro/setup.bash
source /usr/share/drcsim/setup.sh
source /home/mfeng/drc_workspace/devel/setup.bash

alias drchome='cd ~/drc_workspace/src/drc/'
alias drcmake='catkin_make install -DCMAKE_INSTALL_PREFIX:PATH=~/drc_workspace/install -C ~/drc_workspace -DCMAKE_BUILD_TYPE=Release'
alias drceclipse='catkin_make --force-cmake -G"Eclipse CDT4 - Unix Makefiles" -

DCMAKE_BUILD_TYPE=Debug -DCMAKE_ECLIPSE_MAKE_ARGUMENTS=-j8 -C ~/drc_workspace'
export GAZEBO_PLUGIN_PATH=/home/mfeng/drc_workspace/devel/lib:${GAZEBO_PLUGIN_PATH}
export GAZEBO_MODEL_PATH=/home/mfeng/drc_workspace/src/drc/field/robotiq:${GAZEBO_MODEL_PATH}
export PYTHONPATH=/home/mfeng/drc_workspace/src/drc/trajopt/build_trajopt/lib:/home/mfeng/drc_workspace/src/drc/trajopt:${PYTHONPATH}
export LD_LIBRARY_PATH=${LD_LIBRARY_PATH}:/usr/lib
export GUROBI_HOME=/opt/gurobi603/linux64
export OPENRAVE_DATA=${OPENRAVE_DATA}:/home/mfeng/drc_workspace/src/drc/trajopt/
alias drctrajopt='cd ~/drc_workspace/src/drc/trajopt/'