---
name: "libssh2_knownhost_writefile"
section: "3"
platform: "linux"
package: "libssh2"
version: "1.11.1-7"
release: "Arch Linux 2026-11-01"
platforms: ["linux"]
url: "https://new.carta.tech/libssh2_knownhost_writefile"
---

# libssh2\_knownhost\_writefile(3)

write a collection of known hosts to a file

## NAME

libssh2\_knownhost\_writefile - write a collection of known hosts to a file

## SYNOPSIS

```
#include <libssh2.h>
int
libssh2_knownhost_writefile(LIBSSH2_KNOWNHOSTS *hosts,
                            const char *filename, int type);
```

## DESCRIPTION

Writes all the known hosts to the specified file using the specified file format.

*filename* specifies what filename to create

*type* specifies what file type it is, and *LIBSSH2\_KNOWNHOST\_FILE\_OPENSSH* is the only currently supported format.

## RETURN VALUE

Returns a regular libssh2 error code, where negative values are error codes and 0 indicates success.

## AVAILABILITY

Added in libssh2 1.2

## SEE ALSO

**[libssh2\_knownhost\_readfile(3)](/libssh2_knownhost_readfile/3.md)** **[libssh2\_knownhost\_add(3)](/libssh2_knownhost_add/3.md)**