firewall-cmd --list-ports Copy the code

# Fire open port

firewall-cmd --zone=public --add-port=80/tcp --permanent Copy the code

# to restart

firewall  
firewall-cmd --reload Copy the code

Check port usage

ss -tnpl [|grep 22]Copy the code

# check path

which nginx Copy the code

# System Version

uname -a Copy the code

# to check the IP

ip addr Copy the code

# Download file

Wget addressCopy the code

Set environment variables

vim ~/.bashrc Copy the code

# Enable environment variables

source ~/.bashrc  Copy the code

Check the Java installation path

ls -lrt /usr/bin/java Copy the code

# delete user

userdel -r [username] Copy the code

# query permission

getsebool -a | grep ftp Copy the code

# change permission

setsebool tftp_anon_write onCopy the code