hi friends,
How to obtain list of groups we r a member of and redirect it to a file.
how to append the details of current OS to a file.
how to append the estimated file space to a file.
how to append the details of users loged on along wth their current activity into a file.

Thank you...I'm alien to UNIX OS.

uname - a > OS.txt
df -t > space.txt
ps -lf > users.txt

# groups <username> > /tmp/groups.txt

# id -Gn <username> > /tmp/groups.txt

username stands for the user you want the groups for, without username you get the groups for the current user

Thanks mate for your help.