Linux viewing system information commands are essential basic knowledge for Linux beginners. These commands are also very useful, because the first thing to enter Linux may be to view system information first, so it is necessary to learn these Linux system information commands systematically. Necessary!
Below are the commands for querying system information that are commonly used in various linux distributions. You can refer to them, and you can also test and learn. When necessary, man must learn to use the man command, huh, huh
# uname -a # View kernel/ OS /CPU information
# head -n 1 /etc/issue # View OS 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 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 system running time, 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 IDE device detection status at startup Network
# ifconfig # View 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 # Real-time display process status users
# 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
Transfer: http://blog.csdn.net/lhf_tiger/article/details/7102753