Linux Command Tips

1. Delete a large file

#创建空的大文件 #dd if=/dev/zero of=test ibs=1k count=10240000#ll-h test-rw-r--r--. 1 root root 9.8G June 12:10 test# First empty the contents of the file and then delete the file (>test or: >test) #>test#ll-h test-rw-r--r--. 1 root root 0 June 12:12 test# Delete file rm-f test

2. Use the script command-line tool to create output records for the terminal output:

#script My.sessio #创建终端输出文件模式, all subsequent commands and outputs will be output to this file script started, file is My.sessio#pwd/root#whoroot tty1 20 18-06-11 11:06#exit #输入exit或者logout或者按下ctrl +d will exit the recording mode Exitscript done, the file is my.sessio# view the output distance #more my.sessio#less My.sessio #查看中文会乱码 #cat My.sessio

3. Restore the deleted/tmp folder

#mkdir/tmp#chmod 1777/tmp#chown root:root/tmp#ls-ld/tmp

4. Lock a folder

#chmod 0000/test#root users still have access, and the LS and CD commands do not work. To restore it by: #chmod 0755/downloads

5. Password-protect files in vim

#害怕root用户或者其他人偷窥你的个人文件么? Try to use the password protection in vim but the root user can modify, just to encrypt the file! Input: #vim +x filename or, use the: X command to encrypt your file before exiting Vim, and Vim will prompt you to enter a password.

6. Clear garbled on the screen

#reset

7. Output in human readable mode

ls-lh# in an easy-to-read format (e.g. 1K 234M 2G) df-hdf-k# in bytes, KB, MB, or GB output: free-bfree-kfree-mfree-g# output in an easy-to-read format (e.g. 1K 234M 2G) du-h# to Easy-to-read format displays file system permissions stat-c%a/boot# more readable numbers sort-h-a file# display CPU information in easy-to-read form on Linux lscpulscpu-elscpu-e=cpu,node# displays the large of each file in an easy-to-read form Small tree-htree-h/boot

8. Display of known user information on Linux systems

Lslogins

9. How to delete files that were accidentally extracted under the current folder

Use the-t option in tar to list the archive file name, and then rm-f delete #rm-rf ' tar ztf uws.tar.gz '

10. Use Htop to display system process information, more at a glance

#rpm-IVH http://mirrors.ustc.edu.cn/epel/6/x86_64/epel-release-6-8.noarch.rpm#rpm--import/etc/pki/rpm-gpg/ rpm-gpg-key-epel-6# Yum Install Htop#htop

11. Some quick ways to operate

cd-#进入上一条命令的路径下cd #进入用户家目录!! #再次运行上一条命令

12. List all directories or files in the system

Find/-type d|lessfind/-type f|less

13. Copy Files to multiple directories

#echo dir1 dir2 dir3 dir4 dir5|xargs-n 1 cp-v ~/test.py

14. Use tee to output and write to a file simultaneously on the screen

#tree | Tee My.Log

15. Interpreting binary files

# utmpdump/var/log/wtmp

16. Pending update ...

Linux Command Tips