Errorlog truncation
From SybaseWiki
In some cases you want to clear the errorlog of a server of old data and start with a fresh one, but without a reboot. Especially in Sybase IQ, the IQ message file can become *very* big. There is a simple method to do this (only on Linux/Unix). First copy the errorlog for archiving purposes and then create a new one like this:
cp <errorlog> <errorlog>_old > <errorlog>
That's all!