root@ubuntu:~# ls -lid / /boot/home

本文探讨了Linux系统中路径的解析方式,包括如何正确理解并使用带有空格的路径,以及通过具体实例展示了ls、cd等命令的使用技巧。此外,还介绍了less命令在分页浏览文件内容方面的应用。

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root@ubuntu:~# ls -lid / /boot/home
ls: cannot access /boot/home: No such file or directory
2 drwxr-xr-x 23 root root 4096 Oct 27 15:38 /
root@ubuntu:~# ls -lid / /boot /home
     2 drwxr-xr-x 23 root root 4096 Oct 27 15:38 /
786433 drwxr-xr-x  3 root root 4096 Oct 27 08:03 /boot
655361 drwxr-xr-x  3 root root 4096 Oct 27 15:27 /home
还是/和空格的问题
在相对路径中、例如
root@ubuntu:/# cd /home/cxx
root@ubuntu:/home/cxx# 
可以连续/home/cxx
root@ubuntu:~# cd /home /cxx
root@ubuntu:/home# cd~
root@ubuntu:/home# cd ~
root@ubuntu:~# cd / home/ cxx
root@ubuntu:/# pwd
/
说明连续时候表示一个路径,有空格表示一个路径结束,下一个路径看开始
root@ubuntu:~# ls -lid / /boot /home
是三个目录/ ./boot  /home 




shift+PageUp/PageDown 可以在命令行中上下翻页
控制台上已经显示内容的翻页就用 shift+PageUp/PageDown ,如果是要分页显示文件内容则可以用less工具过滤,然后用方向键或PageUp/PageDown上下翻


less /etc/passwd 或 cat /etc/passwd | less 都可以 




用useradd创建xy和aa 用adduser创建w和a在cat /etc/passwd中显示的不同


cxx:x:1000:1000:cxx,,,:/home/cxx:/bin/bash
xy:x:1001:1001::/home/xy:/bin/sh
w:x:1002:1002:,,,:/home/w:/bin/bash
aa:x:1003:1003::/home/aa:/bin/sh
a:x:1004:1004:,,,:/home/a:/bin/bash

lixing@lixing:~/fast_livo2/devel$ source setup.bash lixing@lixing:~/fast_livo2/devel$ roslaunch fast_livo mapping_avia.launch ... logging to /home/lixing/.ros/log/d7f4aeb0-6608-11f0-af32-3db24e61e935/roslaunch-lixing-73455.log Checking log directory for disk usage. This may take a while. Press Ctrl-C to interrupt Done checking log file disk usage. Usage is <1GB. started roslaunch server http://lixing:35845/ SUMMARY ======== PARAMETERS * /common/img_en: 0 * /common/img_topic: /left_camera/image * /common/imu_topic: /livox/imu * /common/lid_topic: /livox/lidar * /common/lidar_en: 1 * /common/ros_driver_bug_fix: False * /evo/pose_output_en: False * /evo/seq_name: CBD_Building_01 * /extrin_calib/Pcl: [0.0194384, 0.104... * /extrin_calib/Rcl: [0.00610193, -0.9... * /extrin_calib/extrinsic_R: [1, 0, 0, 0, 1, 0... * /extrin_calib/extrinsic_T: [0.04165, 0.02326... * /imu/acc_cov: 0.5 * /imu/b_acc_cov: 0.0001 * /imu/b_gyr_cov: 0.0001 * /imu/gyr_cov: 0.3 * /imu/imu_en: True * /imu/imu_int_frame: 30 * /laserMapping/cam_cx: 626.91359 * /laserMapping/cam_cy: 522.799224 * /laserMapping/cam_d0: -0.07616 * /laserMapping/cam_d1: 0.123001 * /laserMapping/cam_d2: -0.00113 * /laserMapping/cam_d3: 0.000251 * /laserMapping/cam_fx: 1293.56944 * /laserMapping/cam_fy: 1293.3155 * /laserMapping/cam_height: 1024 * /laserMapping/cam_model: Pinhole * /laserMapping/cam_width: 1280 * /laserMapping/scale: 0.5 * /lio/beam_err: 0.05 * /lio/dept_err: 0.02 * /lio/layer_init_num: [5, 5, 5, 5, 5] * /lio/max_iterations: 5 * /lio/max_layer: 2 * /lio/max_points_num: 50 * /lio/min_eigen_value: 0.0025 * /lio/voxel_size: 0.5 * /local_map/half_map_size: 100 * /local_map/map_sliding_en: False * /local_map/sliding_thresh: 8 * /pcd_save/colmap_output_en: False * /pcd_save/filter_size_pcd: 0.15 * /pcd_save/interval: -1 * /pcd_save/pcd_save_en: False * /preprocess/blind: 0.8 * /preprocess/filter_size_surf: 0.1 * /preprocess/lidar_type: 1 * /preprocess/point_filter_num: 1 * /preprocess/scan_line: 6 * /publish/blind_rgb_points: 0.0 * /publish/dense_map_en: True * /publish/pub_effect_point_en: False * /publish/pub_plane_en: False * /publish/pub_scan_num: 1 * /rosdistro: noetic * /rosversion: 1.17.4 * /time_offset/exposure_time_init: 0.0 * /time_offset/img_time_offset: 0.1 * /time_offset/imu_time_offset: 0.0 * /uav/gravity_align_en: False * /uav/imu_rate_odom: False * /vio/exposure_estimate_en: True * /vio/img_point_cov: 100 * /vio/inv_expo_cov: 0.1 * /vio/inverse_composition_en: False * /vio/max_iterations: 5 * /vio/normal_en: True * /vio/outlier_threshold: 1000 * /vio/patch_pyrimid_level: 4 * /vio/patch_size: 8 * /vio/raycast_en: False NODES / laserMapping (fast_livo/fastlivo_mapping) republish (image_transport/republish) rviz (rviz/rviz) auto-starting new master process[master]: started with pid [73464] ROS_MASTER_URI=http://localhost:11311 setting /run_id to d7f4aeb0-6608-11f0-af32-3db24e61e935 process[rosout-1]: started with pid [73474] started core service [/rosout] process[laserMapping-2]: started with pid [73481] process[rviz-3]: started with pid [73484] process[republish-4]: started with pid [73486] [INFO] [1753084862.799631899]: Found parameter: laserMapping/cam_model, value: Pinhole [INFO] [1753084862.801137872]: Found parameter: laserMapping/cam_width, value: 1280 [INFO] [1753084862.801585278]: Found parameter: laserMapping/cam_height, value: 1024 [INFO] [1753084862.802377201]: Found parameter: laserMapping/scale, value: 0.5 [INFO] [1753084862.802890892]: Found parameter: laserMapping/cam_fx, value: 1293.57 [INFO] [1753084862.803310245]: Found parameter: laserMapping/cam_fy, value: 1293.32 [INFO] [1753084862.803787630]: Found parameter: laserMapping/cam_cx, value: 626.914 [INFO] [1753084862.804230044]: Found parameter: laserMapping/cam_cy, value: 522.799 [INFO] [1753084862.804656402]: Found parameter: laserMapping/cam_d0, value: -0.07616 [INFO] [1753084862.805159958]: Found parameter: laserMapping/cam_d1, value: 0.123001 [INFO] [1753084862.805688943]: Found parameter: laserMapping/cam_d2, value: -0.00113 [INFO] [1753084862.806193840]: Found parameter: laserMapping/cam_d3, value: 0.000251 scale: 0.5 [laserMapping-2] process has died [pid 73481, exit code -11, cmd /home/lixing/fast_livo2/devel/lib/fast_livo/fastlivo_mapping __name:=laserMapping __log:=/home/lixing/.ros/log/d7f4aeb0-6608-11f0-af32-3db24e61e935/laserMapping-2.log]. log file: /home/lixing/.ros/log/d7f4aeb0-6608-11f0-af32-3db24e61e935/laserMapping-2*.log
最新发布
07-22
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