This might be easy for you remember.

Whatever you are using in your split use it in your -F as is

for example 

perl -naF"/\^/" -e '$key="$F[0],$F[1],$F[2],$F[3]\n"; print $key if ( 
+! $seen{$key} ++ );' datafile
4363,7619082,309839685,309841122

[download]
Notice the -F uses whatever is in your split.

Update: Please quote your param for F switch as you don't want the shell to interpret your backslashes.

In reply to Re: perl one liner with -F special char by sk
in thread perl one liner with -F special char by LanceDeeply

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