One more note - sort, uniq and merging to the string

It is just one more note to myself. We have list of string - for example like this:

bg, cal, cat, cd, chmod, clear, cmp, cp, date, df, diff, du, echo, exit, fg, file, find, grep,
groups, gzip, head, history, id, info, jobs, kill, ln, locate, ls, man , mc, mkdir, more, mv, 
passwd, ps, pwd, rm, rmdir, scp, sed, set, sleep, slogin, sort, ssh, tail, tar, touch, uname,
vi, wc, which, whoami.

I need the same list without repeating of items and sorted.