juuso is right. You may brick your TV sending telnet commands without understanding them.
I advice you to learn linux first, for example by downloading any Live CD of linux, executing terminal window and playing with telnet on PC (not TV!!!)
Until you know linux commands you may execute these commands on TV without fear:

If you want to do a particular thing, tell us what you want to do and somebody will tell you the right command. Be careful.
P.S. mtd_wiselink is the name of directory (folder), not linux command.