The Tcl version numbers can be retrieved from the global Tcl internal variables tcl_version and tcl_patchLevel.

set tcl_version
set tcl_patchLevel

An interesting array is tcl_platform:

array get tcl_platform
=> osVersion 9.4.0 pointerSize 4 byteOrder littleEndian machine i386 platform unix os Darwin user jose wordSize 4


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