спасибо всем)
решение нашел в самом файле conkyrc
вот
# Possible variables to be used:
...
...
...# exec shell command Executes a shell command and displays
# the output in torsmo. warning: this
# takes a lot more resources than other
# variables. I'd recommend coding wanted
# behaviour in C and posting a patch :-).
...
...
...


