Question 112242 in Ubuntu Question posted in
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Ubuntu – bash command fails when used with variables

I use a Linux (Ubuntu) bash.
When I ping an address dirrectly – all work fine.
But when I use it with a variable that gets it’s value from calculation – it fails.

what am i doing wrong?

network=`ip r | grep default | awk '{print $3;}'`
echo $network   # prints: 10.0.0.138
ping $network   # prints: ping: 10.0.0.138: Name or service not known (ERROR???)
ping 10.0.0.138 # prints: PING 10.0.0.138 (10.0.0.138) 56(84) bytes of data. (OK)
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2

Answers


  1. Chosen as BEST ANSWER
    0

    it's becaues the result is colored... ipis aliased to ip -c

    so - this had solved the issue:

     network=`/usr/bin/ip r | grep default | awk '{print $3;}'`

  2. 0

    That sequence should work OK at the command line (it’d be interesting to see a screenshot). However you can lose the grep and use a more rigorous awk script:

    defaultgw=$(ip r | awk '{if ($1=="default") print $3}')

    Then just send a single echo-request without any name resolution:

    ping -n -c 1 $defaultgw
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