HOWTO: Check you external IP Address from the command line

[linuxball]

necromancy .. mia culpa!

I see alot of 'grep | cut | awk' etc .. all of this can by achieved with one command:

awk '/inet addr:/{print (substr($2,6,15))}' <(ifconfig eth0)

or similarly to preface it with 'eth0 IP:'

awk '/inet addr:/ {print "eth0 IP: "(substr($2,6,15))}' <(ifconfig eth0)

HTH ... khay

Why invoking awk or any external command if plain POSIX shell already can do this:

ifconfig eth0|{ IFS=' :';read r;read r r a r;echo $a;}

or similarly to preface it with 'eth0 IP:'

ifconfig eth0|{ IFS=' :';read r;read r r a r;echo "eth0 IP: $a";}

Ciao - linuxball

[stinkeye]

Why invoking awk or any external command if plain POSIX shell already can do this:

ifconfig eth0|{ IFS=' :';read r;read r r a r;echo $a;}

or similarly to preface it with 'eth0 IP:'

ifconfig eth0|{ IFS=' :';read r;read r r a r;echo "eth0 IP: $a";}

Ciao - linuxball

Just gives my LAN address.

[linuxball]

Just gives my LAN address.

You are right. My message was just a reply to message #37 (which admittedly was off-topic) of this thread.

My point was that the built-in features of the used POSIX shell mostly suffice to do post-processing. E.g. two examples which match the topic:

a=$(curl -s checkip.dyndns.org); a=${a##* }; echo ${a%%<*}

a=$(curl -s ipogre.com/linux.php); a=${a##* }; echo ${a%%<*}

The above examples will work in /bin/bash and /bin/sh (dash and other POSIX-compliant shells).

Instead of "curl -s" one can use "wget -qO -".

Ciao - linuxball

[jacobt777]

IP Address:

curl ipogre.com

Hostname:

curl ipogre.com/host

User-agent (browser information):

curl ipogre.com/ua

Client Source Port (What port is the client using to access ipogre.com)

curl ipogre.com/port

[swajime]

You are right. My message was just a reply to message #37 (which admittedly was off-topic) of this thread.

My point was that the built-in features of the used POSIX shell mostly suffice to do post-processing. E.g. two examples which match the topic:

a=$(curl -s checkip.dyndns.org); a=${a##* }; echo ${a%%<*}

a=$(curl -s ipogre.com/linux.php); a=${a##* }; echo ${a%%<*}

The above examples will work in /bin/bash and /bin/sh (dash and other POSIX-compliant shells).

Instead of "curl -s" one can use "wget -qO -".

Ciao - linuxball

exquisitely elegant ... thanx for teaching me ## && %%

[swajime]

That is good for this:

a=$(curl -s checkip.dyndns.org); a=${a##*\.}; a=${a%%<*};color="\033[38;5;${a}m";plain="\033[0m";export PS1="\[${color}\]${PS1}\[${plain}\]"