clear log

Hi all,

Can some one advise me on the clearing log files in Linux ??
We got a warning says 80% full. I don't know what to clear.

6.7M adapters
11M admin
12K lock
28M lib
30G log
47M doc
55M TextAnalysis
56M SDK
68K sldreg
72M DataDirect
80K conf
175M ext
243M DataQuality
324K ssl
339M bin