get logged in username


How can I get the logged in username under remote command execution? I
am using openssh version 4.0 under fedora core 4.

more explanation:
when I do "ssh admin@host", I can get the username "admin", by the
command "who -m", since there is tty which the username is assigned to
it. But suppose I want to execute a remote command "ssh admin@host
myprog", I want to get the username inside the myprog. The command
"who -m", doesn't work because no tty is created for the user.
How can I get the username in this case?

__ \ /_\\_-//_ Mohsen Alimomeni