IBM z/OS OpenSSH include a port of the OpenSSH tools. These tools provide for secure remote login and program execution (ssh) and file transfer (sftp and scp). The sftp and sftp-server commands implement a file transfer program that is similar to ftp, but use ssh for their underlying secure transport. The sftp specification  accounts only for binary transfers. The IBM z/OS sftp client has been enhanced to support ASCII-EBCDIC conversion. Dataset support is not provided.
The Co:Z Co-Processing Toolkit for z/OS includes Co:Z SFTP - a port of the OpenSSH (v8.4p1) sftp-server subsystem and sftp command (renamed as cozsftp). Extensive enhancements have been made to support z/OS facilities such as z/OS datasets and spool files. IBM z/OS OpenSSH is required because Co:Z does not provide the base ssh and sshd components.
Co:Z is compatible with most existing sftp products (see the section called “Remote Client Requirements”).
Transfers datasets via the get and put commands
Navigates z/OS catalogs via the cd command.
Lists dataset information and PDS directories via the ls command.
Records SMF 119 records if user has
Supports IBM FTP compatible user exits. A guide to setting up and using these exits can be found here: http://coztoolkit.com/docs/sftp/coz_sftp_exits.pdf.
Supports direct access to datasets which can be opened in sequential, record mode by the
fopen()C-library routine. This includes:
MVS sequential datasets (QSAM, BSAM, VSAM)
PDS and PDSE members
SYSOUT datasets, including the MVS internal reader
Supports JES2 and JES3 job submission, status and spool file transfer on z/OS 1.9 or later. Future releases of Co:Z SFTP will also support cancel and purge facilities.
Supports text or binary conversion via flexible line-termination rules:
Cr, Lf/Newline, CrLf, Cr and/or Lf, RDW, none
Supports flexible record padding / overflow rules
Supports dataset dynamic allocation (BPXWDYN) keywords
Supports name patterns to automatically associate file transfer options to POSIX files and datasets
|Running Co:Z SFTP with z/OS userids that have superuser authority or UID=0 OMVS segments is not recommended.|
Co:Z SFTP is compatible with a wide variety of operating systems, including Windows, *IX variants, z/OS...
Products supporting the SSH File Transfer Protocol, such as:
Many commercial implementations.
Note: Not all products support all of the Co:Z SFTP extensions. Refer to Client Compatibility for additional information.
 SFTP specification: http://tools.ietf.org/html/draft-ietf-secsh-filexfer-02