dd() is a function exported by Data::Dump. Since %hash as argument to dd would be expanded into a flat list, a reference to %hash is passed to dd. That's what the backslash does, it is the reference operator. See perlref.

The next lines are sample output produced by dd.

perl -le'print map{pack c,($-++?1:13)+ord}split//,ESEL'

In reply to Re^5: Copying files from one file to another file by shmem
in thread Copying files from one file to another file by harishnv

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