Question

9

What does "echo ipv4 >> ~/.curlrc" do?

rated 0 times [ 9] [ 0] / answers: 1 / hits: 3496 / 1 Year ago, sun, february 26, 2023, 8:17:40

I was facing some issue today when trying to install composer with the below command:

curl -sS https://getcomposer.org/installer | sudo php -- --install-dir=/usr/local/bin --filename=composer

It was giving me this error:

curl: (7) Failed to connect to getcomposer.org port 443: Network is unreachable

I googled and found this command:

echo ipv4 >> ~/.curlrc

I ran this and it fixed the problem and composer installed just fine.

But I don't know what the above command does, could anyone explain it?

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egantfis

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3 Years ago

answered 1 Year ago piscen · Accepted Answer

What is does is add "ipv4" to the file "curlrc". Example starting with an empty file:

$ touch 1

$ more 1

$ echo ipv4 >> 1

$ more 1

ipv4

Basically it forces curl to use ipv4.

The manual has this to say about it:

IPv6

curl will connect to a server with IPv6 when a host lookup returns an IPv6 address and fall back to IPv4 if the connection fails. The --ipv4 and --ipv6 options can specify which address to use when both are available. IPv6 addresses can also be specified directly in URLs using the syntax