Linux system to view CPU, machine model, memory and other information

# 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 loaded kernel modules# env # View environment variables

# free -m # View memory usage and swap area usage# df -h # View the usage of each partition# du -sh <directory name> # View the size of the specified directory# grep MemTotal /proc/meminfo # View the total memory# grep MemFree /proc/meminfo # View the amount of free memory# uptime # View system running time, number of users, and load# cat /proc/loadavg # View system load

# 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 for IDE devices)
# dmesg | grep IDE # View the IDE device detection status at startup

# ifconfig # View the properties of all network interfaces # iptables -L # View the firewall settings # route -n # View the routing table # netstat -lntp # View all listening ports # netstat -antp # View all established connections # netstat -s # View network statistics

# ps -ef # View all processes # top # Display process status in real time

# w # View active users # id <username> # View information about a specified user # last # View user login log # cut -d: -f1 /etc/passwd # View all system users # cut -d: -f1 /etc/group # View all system groups # crontab -l # View scheduled tasks for the current user

# chkconfig --list # List all system services # chkconfig --list | grep on # List all started system services

# rpm -qa # View all installed packages

# cat /proc/cpuinfo | grep name | cut -f2 -d: | uniq -c 
   8 Intel(R) Xeon(R) CPU E5410 @ 2.33GHz 
(See that there are 8 logical CPUs and know the CPU model) 

# cat /proc/cpuinfo | grep physical | uniq -c 
   4 physical id : 0 
   4 physical id : 1 
(It means there are actually two 4-core CPUs) 

#getconf LONG_BIT 
  32 
(This means that the current CPU is running in 32-bit mode, but it does not mean that the CPU does not support 64-bit) 

# cat /proc/cpuinfo | grep flags | grep ' lm ' | wc -l 
  8 
(The result is greater than 0, indicating that 64-bit calculation is supported. lm refers to long mode, and if lm is supported, it means 64-bit) 

# dmidecode | grep 'Processor Information'

# cat /proc/meminfo 

# uname -a 
Linux euis1 2.6.9-55.ELsmp #1 SMP Fri Apr 20 17:03:35 EDT 2007 i686 i686 i386 GNU/Linux 
(View the current operating system kernel information) 

# cat /etc/issue | grep Linux 
Red Hat Enterprise Linux AS release 4 (Nahant Update 5) 
(View the current operating system release information)

# dmidecode | grep "Product Name"

# dmesg | grep -i eth