Here are a few, to see a list of comands, you can go to this post:

http://www.webune.com/forums/list-of-the-most-common-linux-shell-commands-used-t45.html


Sme Commands:
alias - Create an alias

awk - Find and Replace text, database sort/validate/index

command - Run a command - ignoring shell functions

continue - Resume the next iteration of a loop

cp - Copy one or more files to another location

cron - Daemon to execute scheduled commands

crontab - Schedule a command to run at a later time

csplit - Split a file into context-determined pieces

cut - Divide a file into several parts

date - Display or change the date & time

dc - Desk Calculator