The interfaces file on Linux works the same as on Unix. It should be in the root of the Sybase ASE installation.
Assuming you have the Sybase ASE environment sourced in your shell it should be:
$SYBASE/interfaces
The utilities to edit the file are dscp
or dsedit,
.
To run dsedit
:
$SYBASE/$SYBASE_OCS/bin/dsedit
To run dscp
:
$SYBASE/$SYBASE_OCS/bin/dscp