UNIX-1.2 UNIX Introduction and Basic Commands

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Here are the list of unix commands used in this tutorial
file types
c – character file
b – block file
l – link
s – socket
/usr – stored application system files
/var – stores email, log files and such
/tmp – stores temporary files
uptime – host up time
w – current users in session
env – environment variables
clear – clears console screen
ctrl + u – clears command line
ctrl + a – move cursor to beginning of command line
ctrl + e – move cursor to end of command line
cat – spit out file content to standard output
tac – same as cat, but spit out file in reverse order
less – view file
more – view file
cal – calendar
top – view processes currently running