【ROS】No.2 ROS入门-ROS文件系统介绍

本教程为初学者介绍ROS文件系统,涵盖`roscd`、`rosls`、`rospack`命令工具的使用,帮助理解ROS软件包、清单文件及文件系统工具。

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ROS文件系统介绍

本教程主要介绍ROS文件系统,包括命令工具`roscd`、`rosls`、`rospack`的使用。 **适用人群:**初学者

0.1预备工作

本教程中我们将会用到`ros-tutorials`程序包,请先安装: ``` $ sudo apt-get install ros--ros-tutorials ``` 将``替换成你所安装的版本(比如Jade、Indigo、hydro、groovy、fuetue、kinetic等)。

比如我的版本是kinetic,我的命令是:

$sudo apt-get install ros-kinetic-ros-tutorials

0.2快速了解文件系统

  • Packages:软件包,是ROS应用程序的组织单元,每一个软件包可以包含程序库可执行文件脚本或者其它手动创建的东西
  • Mainfest(package.xml):清单,是对于[软件包]相关的信息的描述,用于定义软件包相关信息之间的依赖关系,这些信息包括版本、维护者和许可协议等。

0.3文件系统工具

程序代码是分布在众多ROS软件包中,当使用命令工具(比如`ls`和`cd`)来浏览时会比较繁琐,因此ROS提供了专门的命令来简化这些操作。

0.3.1使用rospack

rospack允许你获取软件的相关信息。本教程中,我们只涉及到`rospack`中的`find`参数选项,该选项可以返回软件包的路径信息。 用法: ``` # rospack find [名称] ``` 示例: ``` $ rospack find roscpp ``` 应该输出: ``` YOUR_INSTALL_PATH/share/roscpp ``` 如果你在Ubantu Linux操作系统上通过`apt`来安装的ROS,你应该会准确看到: ``` /opt/ros/groovy/share/roscpp ```
内容概要:该研究通过在黑龙江省某示范村进行24小时实地测试,比较了燃煤炉具与自动/手动进料生物质炉具的污染物排放特征。结果显示,生物质炉具相比燃煤炉具显著降低了PM2.5、CO和SO2的排放(自动进料分别降低41.2%、54.3%、40.0%;手动进料降低35.3%、22.1%、20.0%),但NOx排放未降低甚至有所增加。研究还发现,经济性和便利性是影响生物质炉具推广的重要因素。该研究不仅提供了实际排放数据支持,还通过Python代码详细复现了排放特征比较、减排效果计算和结果可视化,进一步探讨了燃料性质、动态排放特征、碳平衡计算以及政策建议。 适合人群:从事环境科学研究的学者、政府环保部门工作人员、能源政策制定者、关注农村能源转型的社会人士。 使用场景及目标:①评估生物质炉具在农村地区的推广潜力;②为政策制定者提供科学依据,优化补贴政策;③帮助研究人员深入了解生物质炉具的排放特征和技术改进方向;④为企业研发更高效的生物质炉具提供参考。 其他说明:该研究通过大量数据分析和模拟,揭示了生物质炉具在实际应用中的优点和挑战,特别是NOx排放增加的问题。研究还提出了多项具体的技术改进方向和政策建议,如优化进料方式、提高热效率、建设本地颗粒厂等,为生物质炉具的广泛推广提供了可行路径。此外,研究还开发了一个智能政策建议生成系统,可以根据不同地区的特征定制化生成政策建议,为农村能源转型提供了有力支持。
xiaofeiyu@xiaofeiyu-virtual-machine:~/task$ # 检查 rmw 相关包是否安装 dpkg -l | grep ros-humble-rmw # 若缺少关键包,重新安装核心组件 sudo apt update sudo apt install --reinstall ros-humble-ros-base ros-humble-rmw* ii ros-humble-rmw 6.1.2-1jammy.20250607.015321 amd64 Contains the ROS middleware API. ii ros-humble-rmw-connextdds 0.11.3-1jammy.20250607.030145 amd64 A ROS2 RMW implementation built with RTI Connext DDS Professional. ii ros-humble-rmw-connextdds-common 0.11.3-1jammy.20250607.025720 amd64 Common source for RMW implementations built with RTI Connext DDS Professional and RTI Connext DDS Micro. ii ros-humble-rmw-connextdds-common-dbgsym 0.11.3-1jammy.20250607.025720 amd64 debug symbols for ros-humble-rmw-connextdds-common ii ros-humble-rmw-connextdds-dbgsym 0.11.3-1jammy.20250607.030145 amd64 debug symbols for ros-humble-rmw-connextdds ii ros-humble-rmw-cyclonedds-cpp 1.3.4-1jammy.20250607.025717 amd64 Implement the ROS middleware interface using Eclipse CycloneDDS in C++. ii ros-humble-rmw-cyclonedds-cpp-dbgsym 1.3.4-1jammy.20250607.025717 amd64 debug symbols for ros-humble-rmw-cyclonedds-cpp ii ros-humble-rmw-dbgsym 6.1.2-1jammy.20250607.015321 amd64 debug symbols for ros-humble-rmw ii ros-humble-rmw-dds-common 1.6.0-2jammy.20250607.025502 amd64 Define a common interface between DDS implementations of ROS middleware. ii ros-humble-rmw-dds-common-dbgsym 1.6.0-2jammy.20250607.025502 amd64 debug symbols for ros-humble-rmw-dds-common ii ros-humble-rmw-desert 1.0.5-1jammy.20250607.025726 amd64 Implement the ROS middleware interface using the DESERT protocol stack for underwater communications. ii ros-humble-rmw-desert-dbgsym 1.0.5-1jammy.20250607.025726 amd64 debug symbols for ros-humble-rmw-desert ii ros-humble-rmw-fastrtps-cpp 6.2.7-1jammy.20250607.031129 amd64 Implement the ROS middleware interface using eProsima FastRTPS static code generation in C++. ii ros-humble-rmw-fastrtps-cpp-dbgsym 6.2.7-1jammy.20250607.031129 amd64 debug symbols for ros-humble-rmw-fastrtps-cpp ii ros-humble-rmw-fastrtps-dynamic-cpp 6.2.7-1jammy.20250607.031154 amd64 Implement the ROS middleware interface using introspection type support. ii ros-humble-rmw-fastrtps-dynamic-cpp-dbgsym 6.2.7-1jammy.20250607.031154 amd64 debug symbols for ros-humble-rmw-fastrtps-dynamic-cpp ii ros-humble-rmw-fastrtps-shared-cpp 6.2.7-1jammy.20250607.025731 amd64 Code shared on static and dynamic type support of rmw_fastrtps_cpp. ii ros-humble-rmw-fastrtps-shared-cpp-dbgsym 6.2.7-1jammy.20250607.025731 amd64 debug symbols for ros-humble-rmw-fastrtps-shared-cpp ii ros-humble-rmw-gurumdds-cpp 3.4.2-1jammy.20250607.025728 amd64 Implement the ROS middleware interface using GurumNetworks GurumDDS static code generation in C++. ii ros-humble-rmw-gurumdds-cpp-dbgsym 3.4.2-1jammy.20250607.025728 amd64 debug symbols for ros-humble-rmw-gurumdds-cpp ii ros-humble-rmw-implementation 2.8.4-1jammy.20250607.031631 amd64 Proxy implementation of the ROS 2 Middleware Interface. ii ros-humble-rmw-implementation-cmake 6.1.2-1jammy.20250522.072625 amd64 CMake functions which can discover and enumerate available implementations. ii ros-humble-rmw-implementation-dbgsym 2.8.4-1jammy.20250607.031631 amd64 debug symbols for ros-humble-rmw-implementation ii ros-humble-rmw-zenoh-cpp 0.1.1-1jammy.20250607.024355 amd64 A ROS 2 middleware implementation using zenoh-cpp ii ros-humble-rmw-zenoh-cpp-dbgsym 0.1.1-1jammy.20250607.024355 amd64 debug symbols for ros-humble-rmw-zenoh-cpp 获取:1 http://mirrors.tuna.tsinghua.edu.cn/ros2/ubuntu jammy InRelease [4,682 B] 命中:2 https://mirrors.ustc.edu.cn/ubuntu jammy InRelease 命中:4 https://mirrors.ustc.edu.cn/ubuntu jammy-updates InRelease 命中:5 https://mirrors.ustc.edu.cn/ubuntu jammy-backports InRelease 命中:6 https://mirrors.ustc.edu.cn/ubuntu jammy-security InRelease 命中:7 https://packages.microsoft.com/repos/edge stable InRelease 命中:3 https://packages.microsoft.com/repos/code stable InRelease 命中:8 https://apt.foxglove.dev/studio stable InRelease 已下载 4,682 B,耗时 3秒 (1,644 B/s) 正在读取软件包列表... 完成 正在分析软件包的依赖关系树... 完成 正在读取状态信息... 完成 有 301 个软件包可以升级。请执行 ‘apt list --upgradable’ 来查看它们。 正在读取软件包列表... 完成 正在分析软件包的依赖关系树... 完成 正在读取状态信息... 完成 注意,根据Glob 'ros-humble-rmw*' 选中了 'ros-humble-rmw-dds-common-dbgsym' 注意,根据Glob 'ros-humble-rmw*' 选中了 'ros-humble-rmw-desert-dbgsym' 注意,根据Glob 'ros-humble-rmw*' 选中了 'ros-humble-rmw-fastrtps-shared-cpp-dbgsym' 注意,根据Glob 'ros-humble-rmw*' 选中了 'ros-humble-rmw-gurumdds-cpp-dbgsym' 注意,根据Glob 'ros-humble-rmw*' 选中了 'ros-humble-rmw-implementation-dbgsym' 注意,根据Glob 'ros-humble-rmw*' 选中了 'ros-humble-rmw-dds-common' 注意,根据Glob 'ros-humble-rmw*' 选中了 'ros-humble-rmw-fastrtps-dynamic-cpp' 注意,根据Glob 'ros-humble-rmw*' 选中了 'ros-humble-rmw-dbgsym' 注意,根据Glob 'ros-humble-rmw*' 选中了 'ros-humble-rmw-connextdds' 注意,根据Glob 'ros-humble-rmw*' 选中了 'ros-humble-rmw-connextdds-dbgsym' 注意,根据Glob 'ros-humble-rmw*' 选中了 'ros-humble-rmw-zenoh-cpp' 注意,根据Glob 'ros-humble-rmw*' 选中了 'ros-humble-rmw-desert' 注意,根据Glob 'ros-humble-rmw*' 选中了 'ros-humble-rmw-gurumdds-cpp' 注意,根据Glob 'ros-humble-rmw*' 选中了 'ros-humble-rmw-cyclonedds-cpp' 注意,根据Glob 'ros-humble-rmw*' 选中了 'ros-humble-rmw-connextdds-common-dbgsym' 注意,根据Glob 'ros-humble-rmw*' 选中了 'ros-humble-rmw-implementation-cmake' 注意,根据Glob 'ros-humble-rmw*' 选中了 'ros-humble-rmw-implementation' 注意,根据Glob 'ros-humble-rmw*' 选中了 'ros-humble-rmw' 注意,根据Glob 'ros-humble-rmw*' 选中了 'ros-humble-rmw-fastrtps-cpp' 注意,根据Glob 'ros-humble-rmw*' 选中了 'ros-humble-rmw-cyclonedds-cpp-dbgsym' 注意,根据Glob 'ros-humble-rmw*' 选中了 'ros-humble-rmw-connextdds-common' 注意,根据Glob 'ros-humble-rmw*' 选中了 'ros-humble-rmw-fastrtps-shared-cpp' 注意,根据Glob 'ros-humble-rmw*' 选中了 'ros-humble-rmw-fastrtps-dynamic-cpp-dbgsym' 注意,根据Glob 'ros-humble-rmw*' 选中了 'ros-humble-rmw-zenoh-cpp-dbgsym' 注意,根据Glob 'ros-humble-rmw*' 选中了 'ros-humble-rmw-fastrtps-cpp-dbgsym' 下列软件包是自动安装的并且现在不需要了: libpython2-stdlib libpython2.7-minimal libpython2.7-stdlib python-pkg-resources python-setuptools python2 python2-minimal python2.7 python2.7-minimal 使用'sudo apt autoremove'来卸载它(它们)。 下列软件包将被升级: ros-humble-ros-base 升级了 1 个软件包,新安装了 0 个软件包,重新安装了 25 个软件包,要卸载 0 个软件包,有 300 个软件包未被升级。 需要下载 29.0 MB 的归档。 解压缩后会消耗 0 B 的额外空间。 获取:1 http://mirrors.tuna.tsinghua.edu.cn/ros2/ubuntu jammy/main amd64 ros-humble-rmw amd64 6.1.2-1jammy.20250607.015321 [67.5 kB] 获取:2 http://mirrors.tuna.tsinghua.edu.cn/ros2/ubuntu jammy/main amd64 ros-humble-rmw-connextdds amd64 0.11.3-1jammy.20250607.030145 [16.4 kB] 获取:3 http://mirrors.tuna.tsinghua.edu.cn/ros2/ubuntu jammy/main amd64 ros-humble-rmw-connextdds-common amd64 0.11.3-1jammy.20250607.025720 [250 kB] 获取:4 http://mirrors.tuna.tsinghua.edu.cn/ros2/ubuntu jammy/main amd64 ros-humble-rmw-connextdds-common-dbgsym amd64 0.11.3-1jammy.20250607.025720 [2,627 kB] 获取:5 http://mirrors.tuna.tsinghua.edu.cn/ros2/ubuntu jammy/main amd64 ros-humble-rmw-connextdds-dbgsym amd64 0.11.3-1jammy.20250607.030145 [85.0 kB] 获取:6 http://mirrors.tuna.tsinghua.edu.cn/ros2/ubuntu jammy/main amd64 ros-humble-rmw-cyclonedds-cpp amd64 1.3.4-1jammy.20250607.025717 [168 kB] 获取:7 http://mirrors.tuna.tsinghua.edu.cn/ros2/ubuntu jammy/main amd64 ros-humble-rmw-cyclonedds-cpp-dbgsym amd64 1.3.4-1jammy.20250607.025717 [2,176 kB] 获取:8 http://mirrors.tuna.tsinghua.edu.cn/ros2/ubuntu jammy/main amd64 ros-humble-rmw-dbgsym amd64 6.1.2-1jammy.20250607.015321 [34.0 kB] 获取:9 http://mirrors.tuna.tsinghua.edu.cn/ros2/ubuntu jammy/main amd64 ros-humble-rmw-dds-common amd64 1.6.0-2jammy.20250607.025502 [96.8 kB] 获取:10 http://mirrors.tuna.tsinghua.edu.cn/ros2/ubuntu jammy/main amd64 ros-humble-rmw-dds-common-dbgsym amd64 1.6.0-2jammy.20250607.025502 [763 kB] 获取:11 http://mirrors.tuna.tsinghua.edu.cn/ros2/ubuntu jammy/main amd64 ros-humble-rmw-desert amd64 1.0.5-1jammy.20250607.025726 [139 kB] 获取:12 http://mirrors.tuna.tsinghua.edu.cn/ros2/ubuntu jammy/main amd64 ros-humble-rmw-desert-dbgsym amd64 1.0.5-1jammy.20250607.025726 [3,186 kB] 获取:13 http://mirrors.tuna.tsinghua.edu.cn/ros2/ubuntu jammy/main 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http://mirrors.tuna.tsinghua.edu.cn/ros2/ubuntu jammy/main amd64 ros-humble-rmw-gurumdds-cpp-dbgsym amd64 3.4.2-1jammy.20250607.025728 [2,006 kB] 获取:21 http://mirrors.tuna.tsinghua.edu.cn/ros2/ubuntu jammy/main amd64 ros-humble-rmw-implementation amd64 2.8.4-1jammy.20250607.031631 [25.4 kB] 获取:22 http://mirrors.tuna.tsinghua.edu.cn/ros2/ubuntu jammy/main amd64 ros-humble-rmw-implementation-cmake amd64 6.1.2-1jammy.20250522.072625 [8,878 B] 获取:23 http://mirrors.tuna.tsinghua.edu.cn/ros2/ubuntu jammy/main amd64 ros-humble-rmw-implementation-dbgsym amd64 2.8.4-1jammy.20250607.031631 [91.7 kB] 获取:24 http://mirrors.tuna.tsinghua.edu.cn/ros2/ubuntu jammy/main amd64 ros-humble-rmw-zenoh-cpp amd64 0.1.1-1jammy.20250607.024355 [186 kB] 获取:25 http://mirrors.tuna.tsinghua.edu.cn/ros2/ubuntu jammy/main amd64 ros-humble-rmw-zenoh-cpp-dbgsym amd64 0.1.1-1jammy.20250607.024355 [4,829 kB] 获取:26 http://mirrors.tuna.tsinghua.edu.cn/ros2/ubuntu jammy/main amd64 ros-humble-ros-base amd64 0.10.0-1jammy.20250618.005618 [5,632 B] 已下载 29.0 MB,耗时 9秒 (3,373 kB/s) debconf: 无法初始化前端界面:Dialog debconf: (对话框界面要求屏幕画面必须为至少 13 行高及 31 列宽.) debconf: 返回前端界面:Readline (正在读取数据库 ... 系统当前共安装有 310883 个文件和目录。) 准备解压 .../00-ros-humble-rmw_6.1.2-1jammy.20250607.015321_amd64.deb ... 正在解压 ros-humble-rmw (6.1.2-1jammy.20250607.015321) 并覆盖 (6.1.2-1jammy.20250607.015321) ... 准备解压 .../01-ros-humble-rmw-connextdds_0.11.3-1jammy.20250607.030145_amd64.deb ... 正在解压 ros-humble-rmw-connextdds (0.11.3-1jammy.20250607.030145) 并覆盖 (0.11.3-1jammy.20250607.030145) ... 准备解压 .../02-ros-humble-rmw-connextdds-common_0.11.3-1jammy.20250607.025720_amd64.deb ... 正在解压 ros-humble-rmw-connextdds-common (0.11.3-1jammy.20250607.025720) 并覆盖 (0.11.3-1jammy.20250607.025720) ... 准备解压 .../03-ros-humble-rmw-connextdds-common-dbgsym_0.11.3-1jammy.20250607.025720_amd64.deb ... 正在解压 ros-humble-rmw-connextdds-common-dbgsym (0.11.3-1jammy.20250607.025720) 并覆盖 (0.11.3-1jammy.20250607.025720) ... 准备解压 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07-24
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