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Full Discussion: FTP Connection die out
Top Forums Shell Programming and Scripting FTP Connection die out Post 302459105 by DGPickett on Sunday 3rd of October 2010 04:57:33 PM
Old 10-03-2010
FTP is so old, it uses two connections, even in passive more, so you may lose the control connection during the transfer of a long file or command. Consider moving the files in an zip, or using a newer protocol like ssh/scp, rcp that use one connection. scp has optional gzip compression and encryption for security at the cost of cpu, especially at the sending end. Both scp and rcp have a subtree recursion mode -r that packs everything in cpio internally. Sometime I send big files by multiple scp -C parallel commands, as the compression and encryption leave some net bandwidth unused. Sometimes, I send data compressed using the faster 'compress' (LZ not LZW) with ssh or rsh, like this pull:

$ rsh -n source_host "compress <remote_file" | uncompress >local_file

The network may not be slow enough to justify the slower gzip compression even with usually twice as small an output. Similarly, you can collect files using cpio as archiver to stdout and pipe that to a compression tool and then through rsh/ssh to the other end to the matching uncompression tool and a cpio to unarchive the stream. I used this up update a whole subtree in Hong Kong over a 56K WAN from NJ, back in the day. cpio has a do not write to files not older mode, too.
 

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ct_ftp(3erl)						     Erlang Module Definition						      ct_ftp(3erl)

NAME
ct_ftp - FTP client module (based on the FTP support of the INETS application). DESCRIPTION
FTP client module (based on the FTP support of the INETS application). DATA TYPES
connection() = handle() | target_name() (see module ct) : handle() = handle() (see module ct_gen_conn) : Handle for a specific ftp connection. EXPORTS
cd(Connection, Dir) -> ok | {error, Reason} Types Connection = connection() Dir = string() Change directory on remote host. close(Connection) -> ok | {error, Reason} Types Connection = connection() Close the FTP connection. delete(Connection, File) -> ok | {error, Reason} Types Connection = connection() File = string() Delete a file on remote host get(KeyOrName, RemoteFile, LocalFile) -> ok | {error, Reason} Types KeyOrName = Key | Name Key = atom() Name = target_name() (see module ct) RemoteFile = string() LocalFile = string() Open a ftp connection and fetch a file from the remote host. RemoteFile and LocalFile must be absolute paths. The config file must be as for put/3. See also: put/3 . ls(Connection, Dir) -> {ok, Listing} | {error, Reason} Types Connection = connection() Dir = string() Listing = string() List the directory Dir. open(KeyOrName) -> {ok, Handle} | {error, Reason} Types KeyOrName = Key | Name Key = atom() Name = target_name() (see module ct) Handle = handle() Open an FTP connection to the specified node. You can open one connection for a particular Name and use the same name as reference for all subsequent operations. If you want the connection to be associated with Handle instead (in case you need to open multiple connections to a host for example), simply use Key , the configuration variable name, to specify the target. Note that a connection that has no associated target name can only be closed with the handle value. put(KeyOrName, LocalFile, RemoteFile) -> ok | {error, Reason} Types KeyOrName = Key | Name Key = atom() Name = target_name() (see module ct) LocalFile = string() RemoteFile = string() Open a ftp connection and send a file to the remote host. LocalFile and RemoteFile must be absolute paths. If the target host is a "special" node, the ftp address must be specified in the config file like this: {node,[{ftp,IpAddr}]}. If the target host is something else, e.g. a unix host, the config file must also include the username and password (both strings): {unix,[{ftp,IpAddr}, {username,Username}, {password,Password}]}. recv(Connection, RemoteFile) -> ok | {error, Reason} Fetch a file over FTP. The file will get the same name on the local host. See also: recv/3 . recv(Connection, RemoteFile, LocalFile) -> ok | {error, Reason} Types Connection = connection() RemoteFile = string() LocalFile = string() Fetch a file over FTP. The file will be named LocalFile on the local host. send(Connection, LocalFile) -> ok | {error, Reason} Send a file over FTP. The file will get the same name on the remote host. See also: send/3 . send(Connection, LocalFile, RemoteFile) -> ok | {error, Reason} Types Connection = connection() LocalFile = string() RemoteFile = string() Send a file over FTP. The file will be named RemoteFile on the remote host. type(Connection, Type) -> ok | {error, Reason} Types Connection = connection() Type = ascii | binary Change file transfer type AUTHORS
<> common_test 1.5.3 ct_ftp(3erl)
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