LinuxQuestions.org - [SOLVED] BASH Script. Result of command input into variable

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BASH Script. Result of command input into variable

Hi, I have been trying to figure this out and also new to bash scripting as well. How can I put the result of a command into a variable such as this.

CURRENT='wget -O - -q icanhazip.com'

So if I would run

echo $CURRENT

I would get an IP address?

Right now echo returns the command. I can't seem to figure out how exactly to do this. In the end I need two variables. One an IP address returned as my current external IP and the second a variable read from a file that would be an IP address as well.

Thanks!

Here is what you need:

Code:

#!/bin/bash

var1=$(wget -O - -q icanhazip.com)

echo $var1

You need to tell it to execute the command, instead of trying to display it. You can alternatively use backticks, as such:

Code:

`wget -O - -q icanhazip.com`

Cheers,

Josh

Thanks Josh, did the trick!

-Brian

No problem! Please mark your thread as solved using the thread tools located at the top of the page, thanks!

Cheers,

Josh

Note that $(..) is highly recommended over `..`.

A while back I wrote up a script/function that polls a random site for your external ip address, and keeps trying until it gets a successful hit. You can easily edit the list if you discover new ones or one goes bad. I currently have seven working addresses.

Code:

#!/bin/bash



get_current_ip() {

        local -a ipsite

        local -i xc num i



        ipsite=(

                "http://automation.whatismyip.com/n09230945.asp"

                "http://www.showmyip.com/simple/"

                "http://cfaj.freeshell.org/ipaddr.cgi"

                "https://secure.informaction.com/ipecho/"

                "http://icanhazip.com/"

                "http://wooledge.org/myip.cgi"

                "http://ifconfig.me/ip"

              )



        xc=1

        num=${#ipsite[@]}



        until (( xc == 0 )) ; do

                (( i = RANDOM % num ))

                ip=$( wget -t 1 -T 5 -q -O- "${ipsite[i]}" )

                xc=$?

        done



        #some of the sites may output a newline or other junk, so remove any cruft.

        printf "%s" "${ip//[^0-9.]}"

}



get_current_ip



exit 0