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the "delay" utility is an invaluable tool for me. with gnu-screen it allows you to schedule something and have it run and output to the current terminal, unlike "at".
You can also use it like "sleep" with seconds and also with date:
delay until 13:33 friday && echo test
get it from: http://onegeek.org/~tom/software/delay/current/delay.c
(author: Tom Rothamel)
You need: pxz for the actual work (http://jnovy.fedorapeople.org/pxz/). The function could be better with better multifile and stdin/out support.
Show a simple table with disk IO for the specified host. you monitor a LOT of different thing. Mostly used for MRTG and similar, but this is nice for a quick look, which disk is busy.
"public" is your SNMP community
ensure that snmpd is running on the host which you intend to monitor