/*备用
jsshell:
a javascript shell, download from https://archive.mozilla.org/pub/firefox/nightly/latest-mozilla-central/ .
*/
用法1：bash hostloc.sh username password
用法2：bash hostloc.sh accountfile
推荐写入crontab:
43 4 * * * bash /root/hostloc.sh /root/hostlocpsw >/root/hostlog/$(date +\%Y\%m\%d)-log.txt
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