Common commands of linux system

#Fuzzy query occupancy of port 80: Pid/ServerName
netstat -tunlp | grep 80

#Create folders & files
mkdir folderName   &   touch fileName

#cut and copy files
mv /usr/local/rabbitmq-server.3.6.0.tar.gz  /root/mypath/
cp /usr/local/rabbitmq-server.3.6.0.tar.gz  /root/mypath/

#Delete files & folders & batch delete
rm fileName & rm -rf folderName  & rm -rf fileName*

#Upload & Download files
rz upload command & sz /usr/local/rabbitmq-server.3.6.0.tar.gz

#edit configuration file
vim (or vi) fileName (enter preview mode);
Press the i key to enter edit mode;
After editing, press Esc to exit editing mode;
Press Shift + : Enter q! to exit directly, enter wq! to write and exit;

#unzip files
rabbitmq-server.3.6.0.zip/unzip rabbitmq-server.3.6.0.zip
rabbitmq-server.3.6.0.tar.gz/tar -zxvf rabbitmq-server.3.6.0.gz
rabbitmq-server.3.6.0.tar.xz/Unzipping the .tar.xz file requires two steps:
  xz -d rabbitmq-server.3.6.0.tar.xz to .tar file
  tar -xvf rabbitmq-server.3.6.0.tar is decompressed

#check the file
 Expand all: cat fileName; page view (from front to back): more fileName & less fileName; page view (back to front): tail -n 100 fileName

#Create new user password and permissions
 useradd lipan
 passwd lipan
#delete users
 userdel lipan
#Modify user settings, for example: modify the user's home directory, the default is under the /home path
 usermod -d /myhome lipan
#View system disk usage
 df -h