How to get system info in Linux

Here are some useful commands that you can use to find (almost) every information that you want to know about your system from the command line. Most of this commands can be run as non-privileged user, but more information can be obtained if (and should be) run as root.:

linux_inside

General system information:

# uname -a

Process information:

# top

(Shift-M to order the list by memory use)
Memory information:

# free -m

BIOS information:

# dmidecode | less

Distro information:

Ubuntu: # lsb_release -a

Redhat/Mandriva/Fedora: # cat /etc/osname_version

Devices:

# lspci -tv
# lsusb
# lshw

Partitions:

# fdisk -l

Memory usage:

# free -m

Read the rest of the article at: http://alinuxblog.wordpress.com/2008/08/18/how-to-get-system-info-in-linux/