isutl ‑p

Patch an ISAM file to another version

WTSupported in traditional Synergy on Windows
WNSupported in Synergy .NET on Windows
USupported on UNIX


isutl ‑p [rev] [patch_options] filename[ …]



(optional) Revision to patch to. The default is 6 or the value of ISAMC_REV, if set. (See the Discussion for more information.)


(optional) One of the following options:

‑qfile=convert | noconvert

Force large files to be converted or small files to be patched. (By default, small files will be converted and large files will be patched. A patched file can later be patched back to the original revision, whereas a file that has been converted cannot be patched back.)

‑qfile=network_encrypt | nonetwork_encrypt

Set or unset the network encryption flag on the specified file.


The name of the ISAM file(s) you want to patch. The default extension is .ism.


Isutl ‑p patches one ISAM file revision to another revision. By default (if rev is not specified), isutl ‑p patches Revision 2, 3, 4, or 5 files to Revision 6. For example, the following automatically patches all ISAM files with a .ism extension in the current directory to Revision 6:

isutl -p *.ism

If you need to support Synergy versions prior to 10, set ISAMC_REV=4. This will ensure that your ISAM files remain compatible with your pre‑v10 Synergy. (When ISAMC_REV=4, isutl ‑p patches Revision 2 or 3 files to Revision 5, which is a Revision 2 or 3 file structure in a Revision 4 format. Then the file can be used with isutl. Note that a Revision 5 file can only be accessed by Synergy version 7.5 or higher.)

If rev is specified, isutl will attempt to patch the file to that revision.

If ‑p is specified without the ‑qfile=convert option, a revision‑only patch (to rev or the default revision if rev is not specified) occurs. The following files are implicitly converted to the new revision:

Any files larger than these are patched to an intermediate revision (5r6 for Revision 2, 3, or 5 files and 4r6 for Revision 4 files). An intermediate revision file occupies the same footprint as the original file, but it’s a newer representation whose header contains structural differences for Revision 6. Over time, intermediate revision files are automatically converted to Revision 6 either after being cleared or after being rebuilt using isutl ‑ro. Alternatively, at a time when it’s convenient, you can issue the isutl ‑p ‑qfile=convert command to convert all of the large files to Revision 6.

When ‑p is specified with the ‑qfile=network_encrypt option, a revision patch (if rev was specified) occurs first and then the network_encrypt option is applied. If rev is not specified, the file revision is not changed; only the network_encrypt option is applied.