Question

How can I hide curl_easy_perform output (in a shell)?
This is in regards to a C application.

Answer 1

Set the CURLOPT_WRITEFUNCTION and/or CURLOPT_WRITEDATA options:

FILE *f = fopen("target.txt", "wb");
curl_easy_setopt(handle, CURLOPT_WRITEDATA, f);

By default, libcurl writes output to stdout. When you override this (which is what almost any application will do), it will write to another file or to pass chunks of output to a callback. See the documentation for CURLOPT_WRITEFUNCTION for more details.