Commands are not working

I am running Solari 9 in my ultra10 machine. I am unable to run clear command. but when i am checking : $echo $PATH clear it shows

/usr/sbin: /usr/bin: / usr/dt/bin: /usr/openwin/bin: /bin: /usr/ucb clear

I am also unable to run Netscape browser:

Error: No web browser coomand found in your path.

But the command is in path

I am able to run clear command from windows machine using Telnet to access the ultra10.

[449 byte] By [xpert123] at [2007-11-26 10:30:22]