When I have
当我有
exec 3>>file # file descriptor 3 now points to file
[ $dryrun ] && exec 3>&1 # or possibly to stdout
echo "running">&3
exec 3>&- # and is now closed
exec 3>>file
阅读背景：
sh:我怎样才能避免对编号的文件描述符造成破坏呢?
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