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1;0 blazar@feather:~/tmp$ perl -e 'open F, ">foo.txt"; seek F, 2**30, +0; print F 1' ... -rw-r--r-- 1 blazar blazar 1.1G Nov 16 10:22 bar.txt -rw-r--r-- 1 blazar blazar 1.1G Nov 16 10:22 foo.txt 28K .