15 lines
251 B
Bash
15 lines
251 B
Bash
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#/bin/bash
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# Read domains form stdin and echo the ones resolved successfully
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server=""
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if [ "$#" -ge 1 ] && [ -n "$1" ] ; then
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server="$1"
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fi
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while read domain; do
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host "$domain" $server &>/dev/null
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[ "$?" -eq 0 ] && echo "$domain"
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done
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exit 0
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