useful tools

lxzrz: Communication package providing the X, Y, and ZMODEM file transfer protocols

       http://www.ohse.de/uwe/software/lrzsz.html

kibitz: similar to multi-user mode of screen

       http://expect.nist.gov/  

       http://nails.blog.51cto.com/640492/138028

dstat: Dstat is a versatile replacement for vmstat, iostat and ifstat

       http://dag.wieers.com/home-made/dstat/