Tcl (Tool Command Language) is a very simple, open-source-licensed programming language. Tcl provides basic language features such as variables, procedures, and control, and it runs on almost any modern OS, such as Unix (Linux and non-Linux), MacOS, Windows 95/98/NT/2000/XP/…, PDA systems, and many more. But the key feature of Tcl is its extensibility.
And unlike any other scripting languages, just -v option won’t give you the version of your Tcl, there is a separate variable defined for that, tcl_version. So, just say puts $tcl_version to know your Tcl version.
There is a good Wiki for Tcl users, give a try: wiki.tcl.tk
Gang's Wavelength 
Thanks a lot for the info!
To get more detailed patch level info, one can use
% info patchlevelas in following output:% puts $tcl_version
8.4
% info patchlevel
8.4.13
Miaoyin,
Thanks a ton for sharing this additional information with us.
Hi Can any tell me how to istall Tcl in linux. Please help me.
Hi Guru, you can refer the below link to install Tcl on Linux machine!
http://www.tcl.tk/doc/howto/compile.html#install
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