Try mrtg... It allows you to issue one command that produces a number.... I use radwho -r | grep (server IP) | wc -l... This number is filed and I have the script run every five minutes. MRTG is the way to go...
interesting idea ....
However, we would also like a calendar style output (wish I knew the real name for this style of chart). It has the hours along the top and each user as a row. The columns are colored in boxes so you can see trends where say the 11 - 2 period everyone is on.
The mrtg idea is great for seeing how many people use it, how much data they transfer, etc.
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