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a function to find the fastest free DNS server

Terminal - a function to find the fastest free DNS server
timeDNS () { { for x in "${local_DNS}" "208.67.222.222" "208.67.220.220" "198.153.192.1" "198.153.194.1" "156.154.70.1" "156.154.71.1" "8.8.8.8" "8.8.4.4"; do ({ echo -n "$x "; dig @"$x" "$*"|grep Query ; }|sponge &) done ; } | sort -n -k5 ; }
2011-08-18 01:11:53
User: unixmonkey365
Functions: dig echo grep sort
0
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a function to find the fastest free DNS server

Evoke from the command like as:

timeDNS commandlinefu.com

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This isn't too terribly practical, but it is a good code example of using subshells to run the queries in parallel and the use of an "anonymous function" (a/k/a "inline group") to group i/o.

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I'm assuming you have already defined your local DNS cache as ${local_DNS}, (here, it's 192.168.0.1).

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You do need to install `moreutils` to get `sponge`.

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If you're willing to wait, a slower version w/o sponge, (and w/o sorting), is this:

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DNS () { for x in "192.168.0.1" "208.67.222.222" "208.67.220.220" "198.153.192.1" "198.153.194.1" "156.154.70.1" "156.154.71.1" "8.8.8.8" "8.8.4.4"; do (echo -n "$x "; dig @"$x" "$*"|grep Query) ; done ; }

Show sample output | Add to favourites | Report as malicious

Alternatives

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Terminal - Alternatives

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What others think

This is odd. Today is the 22nd, and I posted it on the 18th, yet it's still not visible. WTF?

Comment by unixmonkey365 91 weeks and 5 days ago

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