Lost pico editor

I del a lot of files,after that I can't find pico. I have to use vi. However, I like pico.
Can should I do ?

Reinstall pico....

Before you do that, try

find / -name "pico" -print

Just to rule out the possibility that it hasn't been moved, it's not in your $PATH, etc.

Then, either install from your installation media, or download.

Cheers
ZB

Could you tell me how to reinstall?
I am a novice to UNIX.

OK that depends on your UNIX flavour.

Please post the output of

uname -a

Cheers
ZB

the output of uname -a is

OSF1 vanity.xxx.edu v4.0 1229 alpha