Question

Is there a way to echo only the server ip adress from Bash? I am on a Linux/Debian6.

My intent is to write to “/etc/hosts” the pair domain_name IP for each new domain I register in the server.

As this bash script will be opened for public use, I am trying to find a way of getting this information via cli.

CONCLUSION:

This is the final code, based on the clues my friends helped me with:

newhost() {
    DMN=$1
    X=`ifconfig | grep Bcast`
    Y=`echo "${X#*:}"`
    DNS=`echo "${Y%\  B*}"` # server DNS(207.112.37.222)
    H='/etc/hosts' #hostfile
    PAIR="$DNS\t$DMN"
    if grep -i --silent "$DMN" "$H"; then
        echo -e "$DMN already exists in $H"
    else
        bash <<EOF
echo -e "$PAIR" >> "$H"
EOF
        echo -e "$PAIR added to $H"
    fi
}

By the way, Isn’t it funny that some born-already-smart dudes voted to close the question?

Thanks.

Answer 1

use:

ifconfig – your ip will be after the inet addr: in this case 1.1.1.1

sample output:

root@server [~]# ifconfig
eth0      Link encap:Ethernet  HWaddr 00:0A:E4:89:0B:97
          inet addr:1.1.1.1  Bcast:1.1.1.63  Mask:255.255.255.192
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1/or modify
          RX packets:14804377317 errors:0 dropped:0 overruns:0 frame:0
          TX packets:11766937374 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:13799286299902 (12.5 TiB)  TX bytes:4891709752100 (4.4 TiB)
          Interrupt:169 Memory:fa000000-fa012800  will be useful,

http://www.debianadmin.com/network-interface-configuration-using-ifconfig.html