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PS D:\tmp> perl -E"$|=1;print $]" >.\tmp.log                    # writ
+es log immediately 
PS D:\tmp> cat .\tmp.log
...

d:\tmp> type .\tmp.log
5.032001

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PS D:\tmp> echo '$|=1;print $];sleep 10' > tst.pl
PS D:\tmp> cat .\tst.pl
...
PS D:\tmp> perl tst.pl >tmp.log        # don't CTRL-c, just wait
PS D:\tmp> cat .\tmp.log
5.032001