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Asked: 2026-06-17T06:27:12+00:00

When I use cURL, I Found it seems that cURL knew whether its own

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When I use cURL, I Found it seems that cURL knew whether its own output will be redirect, or be input for another program.

Following are two different command:

curl http://www.google.com/

The output will be:

<HTML><HEAD>......blah, blah......</HEAD></HTML>

But if I use redirect or pipe, cURL will print its download status.

curl http://www.google.com/ | xargs echo

the output will be leading with:

  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
100   376  100   376    0     0   2729      0 --:--:-- --:--:-- --:--:--  5295
<HTML><HEAD>......blah, blah......</HEAD></HTML>

My question is: how cURL know whether its print will be redirect?

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1 Answer

  1. Editorial Team

    isatty(3) will tell you if a FD is connected to a TTY.

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