Check if File Exists

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var success = false;

// This example assumes the Chilkat API to have been previously unlocked.
// See Global Unlock Sample for sample code.

var sftp = new CkSFtp();

// Connect to the SSH server.  
var hostname = "sftp.example.com";
var port = 22;
success = sftp.Connect(hostname,port);
if (success !== true) {
    console.log(sftp.LastErrorText);
    return;
}

// Authenticate with the SSH server.  Chilkat SFTP supports
// both password-based authenication as well as public-key
// authentication.  This example uses password authenication.
success = sftp.AuthenticatePw("myLogin","myPassword");
if (success !== true) {
    console.log(sftp.LastErrorText);
    return;
}

// After authenticating, the SFTP subsystem must be initialized:
success = sftp.InitializeSftp();
if (success !== true) {
    console.log(sftp.LastErrorText);
    return;
}

// Check to see if a file exists

// The return value is one of the following values:
// -1: Unable to check. Examine the LastErrorText to determine the reason for failure.
// 0: File does not exist.
// 1: The regular file exists.
// 2: It exists, but it is a directory.
// 3: It exists, but it is a symlink (only possible if followLinks is false)
// 4: It exists, but it is a special filesystem entry type.
// 5: It exists, but it is an unkown filesystem entry type.
// 6: It exists, but it is an socket filesystem entry type.
// 7: It exists, but it is an char device entry type.
// 8: It exists, but it is an block device entry type.
// 9: It exists, but it is an FIFO entry type.

var followLinks = true;
var status = sftp.FileExists("someDir/someFile.txt",followLinks);
if (status < 0) {
    console.log(sftp.LastErrorText);
    return;
}

console.log("status = " + status);

console.log("Success");