What is ACL: access control list
Order:
mount -o remount: Remount an already mounted file system in a different way. For example, it was originally a unique system, and now it can be mounted with read-write.
eg:mount -o remount ,acl / (add ACL function to root directory / remount)
ACL setting and viewing:
setfacl -mu: user: permission target file (setfacl -mu: byf: rw test1, which means setting the permission of user byf to rw for the test1 file)
setfacl -mg: user group: permission target file (same as above)
setfacl -mm: permission target file (set mask effective permission on target file)
setfacl -md:[ug]: user or group: permission (add a d table to inherit before u or g, that is, the newly generated files in this directory also inherit the acl settings)
getfacl target file (getfacl test1, view the acl permissions of the target file test1)
env: View the environment parameters of the current account
su -username or su -l username: The full switch user's environment. If you want to execute the root command once, you can use su - -c "command string"
sudo -u username: lets you execute commands as another user
sh -c "multiple command strings, available between command strings; separated"
Firewall ports open:
The configuration file is /etc/sysconfig/iptables
If I want to open port 8080, I can
在：-A INPUT -m state --state NEW -m tcp -p tcp --dport 22 -j ACCEPT
Followed by -A INPUT -m state --state NEW -m tcp -p tcp --dport 8080 -j ACCEPT
After adding and saving, restart the service service iptables restart|start|stop
/sbin/iptables -L -n: View firewall rules
/usr/ local / webserver / nginx / sbin / nginx - s reload # Reload configuration files / usr / local / webserver / nginx / sbin / nginx - s reopen #Restart Nginx / usr / local / webserver / nginx / sbin / nginx - s stop # stop Nginx
alias: set the nickname of the command.eg alias vi=vim means that typing vi is equivalent to typing vim
netstat -anp | grep 80: View the status of port 80
ps -ef | grep "nginx": View processes related to nginx
!2: Execute the second command under history