operation and maintenance of linux common commands - continuously updated (welcome message to add)

cat / etc / passwd | grep bash # can view the current logged-on user 
id user name # Display the user information 
last # view the user login log 
cat / etc / redhat-release # View linux release information 
uname -a # kernel version information 
hostname -A # View the computer name 
route -n # View the routing table 
free -g # View disk size 
lscpu # View CPU information 
cat / proc / cpuinfo | grep " processor" | wc -l # View the number of logical CPU 
df -h # View each disk partition usage, including the used space and the remaining space 
du -sh * # to view the current size of the case file of each directory 
du -sh * | file size under all sort -rh # view the catalog and sort according to size 
real-time display top # process state 
crontab -l # to view the current user's scheduled tasks service 
netstat -ntlp # View all listening ports 
rpm -e --nodeps software written in the name RPM software #