/gist:6076361
Last active Dec 20, 2015
updates /etc/hosts whenever a host ip changes useful for creating host aliases usage: update-hosts <host_alias> <host_ip>
| hosts=/etc/hosts | |
| host=$1 | |
| ip=$2 | |
| if [ "$ip" = "" ]; then | |
| ip=$(wget -qO- http://checkip.dyndns.org | cut -f2 -d":" | cut -f1 -d"<" | sed "s/ //") | |
| fi | |
| line=$(grep $host $hosts) | |
| if [ $? -ne 0 ]; then | |
| echo "$ip\t$host\t# $(date)" >> $hosts | |
| exit 0 | |
| fi | |
| oldip=$(echo "$line" | awk '{print $1}') | |
| if [ "$ip" != "$oldip" ]; then | |
| sed -i "s/$line/$ip\t$host\t# $(date)/" $hosts | |
| fi |
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