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$ echo "hello" > toto
$ cat toto
hello
$ perl -e 'open F, "<toto"; sleep 30; print <F>'

$ perl -e 'open F, ">toto"; print F 'goodbye'; close F; sleep 30'

perl -e 'open F, ">toto"; system ("mv toto tata"); print F 'goodbye'; 
+close F; sleep 30'

perl -e 'open F, ">toto"; system ("mv toto tata"); print F 'goodbye'; 
+sleep 30'