Linux commonly used commands
Mkdir created
Rm -rf delete
Chmod -R 777 permissions
Mysql -uroot -r
quit exit
find / -name svn find location
Turn off the firewall and selinux
Redhat uses SELinux to enhance security. The way to close it is:
1. Permanently effective
Modify SELINUX="" in the /etc/selinux/config file to be disabled, and then restart.
2. Effective immediately
setenforce 0
The method to turn off the firewall is:
1. Permanently effective
Turn on: chkconfig iptables on
Close: chkconfig iptables off
2. Effective immediately, invalid after restart
Open: service iptables start
Close: service iptables stop
It should be noted that other services under Linux can be opened and closed with the above commands
supplement:
a. The firewall also needs to turn off the ipv6 firewall:
chkconfig ip6tables off
And you can check the status through the following command:
chkconfig --list iptables
b. The status of selinux can be viewed with the following command:
Sestatus
===============
# uname -a # View kernel/ operating system /CPU information
# head -n 1 /etc/issue # View operating system version
# cat /proc/cpuinfo # View CPU information
# hostname # View computer name
# lspci -tv # List All PCI devices
# lsusb -tv # List all USB devices
# lsmod # List loaded kernel modules
# env # View environment variable resources
# free -m # View memory usage and swap area usage
# df -h # View each Partition usage
# du -sh <directory name> # View the size of the specified directory
# grep MemTotal /proc/meminfo # View the total amount of memory
# grep MemFree /proc/meminfo # View the amount of free memory
# uptime # View the system running time and users Number, load
# cat /proc/loadavg # View system load disks and partitions
# mount | column -t # View mounted partition status
# fdisk -l # View all partitions
# swapon -s # View all swap partitions
# hdparm -i /dev/hda # View disk parameters (only for IDE devices)
# dmesg | grep IDE # View the IDE device detection status network at startup
# ifconfig # View the properties of all network interfaces
# iptables -L # View firewall settings
# route -n # View routing table
# netstat -lntp # View all listening ports
# netstat -antp # View all established connections
# netstat -s # View network statistics process
# ps -ef # View all processes
# top # Display process status in real time User
# w # View active users
# id <User name> # View specified User information
# last # View user login logs
# cut -d: -f1 /etc/passwd # View all users in the system
# cut -d: -f1 /etc/group # View all groups in the system
# crontab -l # View the current user's Scheduled Task Service
# chkconfig –list # List all system services
# chkconfig –list | grep on # List all started system service programs
# rpm -qa # View all installed packages