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.