[squid-users] Square Bracket in LogFormat

[GM Test]

Hello,

I'm not sure if this is the right place to ask this question but in
the *logformat
*command, I cannot seem to work out what the square bracket is for?

For example:

logformat squid %ts.%03tu %6tr %>a %Ss/%03>Hs %<st %rm %ru %[un %Sh/%<a %mt


http://www.squid-cache.org/Doc/config/logformat/

Would anyone be able to tell me?

Many thanks,
lan
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