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What does ":>" does here?

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linux-howto

http://unix.stackexchange.com – I saw some postinst script # setting wget options :> wgetrc echo "noclobber = off" >> wgetrc echo "dir_prefix = ." >> wgetrc echo "dirstruct = off" >> wgetrc echo "verbose = on" >> wgetrc echo "progress = dot:default" >> wgetrc echo "tries = 2" >> wgetrc What does the :> do here ? (HowTos)