System: # uname-a # View kernel/OS/CPU information # cat/etc/issue # cat/etc/redhat-release # View OS version # cat/proc/cpuinfo # View CPU information # hostname # view the metering system:
# Uname-a # View kernel/operating system/CPU information
# Cat/etc/issue
# Cat/etc/redhat-release # 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 variables
Resource:
# Free-m # View memory usage and swap zone usage
# Df-h # view the usage of each partition
# Du-sh <目录名> # 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 IDE device detection status at startup
Network:
# 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 # Display process status in real time (for details in another article)
User:
# W # View active users
# Id <用户名> # Viewing 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 tasks of the current user
Service:
# Chkconfig-list # list all System Services
# Chkconfig-list | grep on # list all started System Services
Program:
# Rpm-qa # View all installed software packages
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