sudo chmod -R +x /home/username/catkin_ws/

这个命令的作用是给`/home/username/catkin_ws/`目录下的所有文件和子目录添加可执行权限。\[1\]在Linux中，`chmod`命令用于修改文件或目录的权限。`-R`选项表示递归地修改目录及其子目录下的所有文件的权限。`+x`表示添加可执行权限。所以这个命令的意思是将`/home/username/catkin_ws/`目录下的所有文件和子目录都设置为可执行。
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