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As you can see I set up a simple script to ping google(8.8.8.8) that should respond back with "Good Ping"

if [ "ping -c 1 8.8.8.8 | grep 64 | cut -c 1-2" == '64' ]; then echo "Good Ping"; fi

But it never responds with its echo statement

At the same time I can run:

ping -c 1 8.8.8.8 | grep 64 | cut -c 1-2

This resolves to '64' without an issue

I don't understand the top script will never print "Good Ping", could someone explain?

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The string ping -c 1 8.8.8.8 | grep 64 | cut -c 1-2 is never equal to 64, but that's what you test for. If you want to test a command, use command substitution:

if [ $(ping -c 1 8.8.8.8 | grep 64 | cut -c 1-2) == 64 ] ; then echo Good Ping fi

`...` can be used instead of $(...).

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  • In general it's good practice to use $() over `` as long as the shell supports it because nesting is easier that way. Commented Nov 15, 2015 at 20:08
  • ahhhh I was trying to compare that string and not its result... Thanks Choroba Commented Nov 15, 2015 at 20:15

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