Common viewing information set in LINUX

# Uname-A # view kernel/operating system/CPU Information
# Cat/proc/version # view the kernel
# Cat/etc/issue # view the operating system version
# Head-N 1/etc/issue # view the operating system version
# Cat/proc/cpuinfo # view CPU Information
# Hostname # view the 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 zone usage
# Df-h # view the usage of each partition
# Du-sh <Directory Name> # view the size of a specified directory
# Grep MemTotal/proc/meminfo # view total memory
# Grep MemFree/proc/meminfo # view the Amount of idle memory
# Uptime # view system running time, number of users, and load
# Cat/proc/loadavg # view system load disks and partitions
# Mount | column-t # view the status of the mounted Partition
# Fdisk-l # view all partitions
# Swapon-s # view all swap partitions
# Hdparm-I/dev/hda # view disk parameters (only applicable to IDE devices)
# Dmesg | grep IDE # view the network of the IDE Device Detection Status at startup
# Ifconfig # view the attributes of all network interfaces
# Iptables-L # view firewall settings
# Route-n # view the route 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 of Process status users
# W # view active users
# Id <User Name> # view specified user information
# Last # view User Logon 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 scheduled Task Service of the current user
# Chkconfig-list # list all system services
# Chkconfig-list | grep on # list all started system service programs
# Rpm-qa # view all installed software packages
Cat/proc/cpuinfo: View CPU Parameters
Cat/proc/partitions: View hard disks and partitions
Cat/proc/meminfo: view memory information
Cat/proc/version: view the version, similar to uname-r
Cat/proc/ioports: view the device's io port
Cat/proc/interrupts: view the interrupt
Cat/proc/pci: View pci device information
Cat/proc/swaps: View information about all swap partitions