28 lines
725 B
Bash
Executable File
28 lines
725 B
Bash
Executable File
#!/bin/bash
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if [ -z "$1" ]
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then
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echo "You must specify a filename to read from"
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exit 1;
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fi
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if [ ! -f "$1" ]
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then
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echo "File $1 does not exist or is not a file"
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exit 1;
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fi
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while read ip n
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do
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# Uncomment following to use /etc/hosts
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# name=$(awk -v ip=$ip '$1 ~ ip{print $2}' /etc/hosts)
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# Uncomment following to use nslookup
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# name=$(nslookup $ip| grep "name ="|sed 's/.*=//')
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# Uncomment following line to use dig (thanks to Charles Duffy)
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#name=$(dig +short -x $ip)i
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if [ -z "$2" ]
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then
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resolvedIP=$(dig +short +x "$ip")
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else
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resolvedIP=$(dig +short +x "$ip" "$2")
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fi
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[[ -z "$resolvedIP" ]] && echo "$ip" lookup failure || echo "$ip" resolved to "$resolvedIP"
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done < $1
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