例 無限にnslookup
while (/bin/true) do nslookup -sil example.com ; sleep 1; done;
回線不安定時のwget
while (/bin/true) do wget -c http://example.com/example.txt ; sleep 1; done;
参考
http://members.at.infoseek.co.jp/futora/wget153/option.html#continue
http://opentechpress.jp/developer/07/01/15/2350221.shtml