Linux View System Information command CPU, memory, process, hard disk, Nic __linux

Source: Internet
Author: User
Tags memory usage
System
# 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 the loaded kernel modules
# env # View Environment variables
Resources
# free-m # View memory usage and swap area usage
# df-h # View the usage of each partition
# du-sh # View the size of the specified directory
# grep Memtotal/proc/meminfo # View Total Memory
# grep Memfree/proc/meminfo # View Idle memory
# uptime # View system run time, number of users, load
# cat/proc/loadavg # View System load
Disks and partitions
# Mount | COLUMN-T # View the partition status of the hook
# fdisk-l # View all partitions
# swapon-s # View all swap partitions
# hdparm-i/dev/hda # View disk parameters (IDE devices only)
# DMESG | grep IDE # View IDE Device detection status at startup
Internet
# ifconfig # View properties of all network interfaces
# iptables-l # View firewall settings
# route-n # View the routing table
# netstat-lntp # View all listening ports
# netstat-antp # View all connections that have been established
# netstat-s # View Network statistics
Process
# ps-ef # View All Processes
# top # Real-time display of process status
User
# w # View active Users
# ID # view specified user information
# last # View User login log
# cut-d:-f1/etc/passwd # View All users of the system
# cut-d:-f1/etc/group # View all groups of the system
# crontab-l # View scheduled tasks for the current user
Service
# chkconfig--list # list all system services
# chkconfig--list | grep on # Lists all initiated system services
Program
# rpm-qa # View all installed Packages

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