---
name: "CURLOPT_APPEND"
section: "3"
platform: "linux"
package: "curl"
version: "8.23.0-1"
release: "Arch Linux 2026-11-01"
platforms: ["linux", "macos"]
url: "https://new.carta.tech/CURLOPT_APPEND"
---

# CURLOPT\_APPEND(3)

append to the remote file

## NAME

CURLOPT\_APPEND - append to the remote file

## SYNOPSIS

```
#include <curl/curl.h>
CURLcode curl_easy_setopt(CURL *handle, CURLOPT_APPEND, long append);
```

## DESCRIPTION

A long parameter set to 1 tells the library to append to the remote file instead of overwrite it. This is only useful when uploading to an FTP site.

## DEFAULT

0 (disabled)

## PROTOCOLS

This functionality affects ftp and sftp

## EXAMPLE

```
int main(void)
{
  CURL *curl = curl_easy_init();
  if(curl) {
    CURLcode result;
    curl_easy_setopt(curl, CURLOPT_URL, "ftp://example.com/dir/to/newfile");
    curl_easy_setopt(curl, CURLOPT_UPLOAD, 1L);
    curl_easy_setopt(curl, CURLOPT_APPEND, 1L);
    result = curl_easy_perform(curl);
    curl_easy_cleanup(curl);
  }
}
```

## HISTORY

This option was known as CURLOPT\_FTPAPPEND up to 7.16.4

## AVAILABILITY

Added in curl 7.17.0

## RETURN VALUE

*[curl\_easy\_setopt(3)](/curl_easy_setopt/3.md)* returns a CURLcode indicating success or error.

CURLE\_OK (0) means everything was OK, non-zero means an error occurred, see *[libcurl-errors(3)](/libcurl-errors/3.md)*.

## SEE ALSO

[**CURLOPT\_DIRLISTONLY**(3)](/CURLOPT_DIRLISTONLY/3.md), [**CURLOPT\_RESUME\_FROM**(3)](/CURLOPT_RESUME_FROM/3.md), [**CURLOPT\_UPLOAD**(3)](/CURLOPT_UPLOAD/3.md)