vim creates a file vi writes a file bc calculator quit exits the calculator mkdir creates a directory
mkdir -p recursively creates a directory rmdir deletes a directory hostname displays the system name
who displays the information of the currently logged in user cat view files more view all content
date displays the current date and time reboot reboot init 6 reboot rm delete
rm -rf delete any file touch create file touch ...: create multiple files in the agreed directory
tail View the countdown column of the file tac File in reverse order head View the first ten lines of the file head -n Add - to display a few lines
grep filter cat 123|grep happy
passwd changes the user password passwd root specifies the change of the user password df checks the disk usage
top View memory and CPU performance mount Mount local files or disks mount/dev/sr0 /opt
free View memory usage File name Directory name MV Move files or directories Reference: mv 123 nihao
find Find eg: find path-name ifcfg -eth0 su switch user EXIT log out
userdel delete user userdel 123
graupadd creates a group name groupdel deletes a group iostat checks the disk status
tar xvf file name tar gz decompress nginx service installation package
Unzip decompresses files ending with ZIP ps -AUX View currently running processes
du View file or directory size clear clear screen cal display calendar cp copy
chmod changes file permissions chmod 357 123.txt
chwon changes the file owner and group