Bash scrippet to extract all eth* addresses from /etc/network/interfaces
Posted 12-02-2014 at 08:03 AM by catkin
I looked for such a script on the 'net and did not find so here's a solution, tessted with the edge case of an address line at the end of the file:
Code:
#!/bin/bash
eth_regex=^eth
true=true
false=
address=
have_iface_flag=$false
while read -r word1 word2 word3 word4 _
do
case $word1 in
iface )
[[ $word2 =~ $eth_regex && $word4 != dhcp ]] \
&& have_iface_flag=$true
;;
address )
if [[ $have_iface_flag ]]; then
eth_addresses+=($word2)
have_iface_flag=$false
fi
;;
esac
done < /etc/network/interfaces
[[ $have_iface_flag && $address != '' ]] && eth_addresses+=($address)
if [[ $eth_addresses != '' ]]; then
for ((i=0;i<${#eth_addresses[*]};i++))
do
echo "eth_addresses[$i]: ${eth_addresses[i]}"
done
fi
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