Red Hat system information command Summary

System # uname-A # view kernel/operating system/CPU Information
# 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 mounted partitions
# 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 # 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 for others see http://www.pixelbeat.org/cmdline.html