Linux Command Line

Command	Description
# arch	show architecture of machine(1)   [man]
# cal 2007	show the timetable of 2007   [man]
# cat /proc/cpuinfo	show information CPU info   [man]
# cat /proc/interrupts	show interrupts   [man]
# cat /proc/meminfo	verify memory use   [man]
# cat /proc/swaps	show file(s) swap   [man]
# cat /proc/version	show version of the kernel   [man]
# cat /proc/net/dev	show network adpters and statistics   [man]
# cat /proc/mounts	show mounted file system(s)   [man]
# clock -w	save date changes on BIOS   [man]
# date	show system date   [man]
# date 041217002007.00	set date and time - MonthDayhoursMinutesYear.Seconds   [man]
# dmidecode -q	show hardware system components - (SMBIOS / DMI)   [man]
# hdparm -i /dev/hda	displays the characteristics of a hard-disk   [man]
# hdparm -tT /dev/sda	perform test reading on a hard-disk   [man]
# lspci -tv	display PCI devices   [man]
# lsusb -tv	show USB devices   [man]
# uname -m	show architecture of machine(2)   [man]
# uname -r	show used kernel version   [man]

For more commands, follow this link;
http://www.linuxguide.it/commands_list.php