Prerequisites
If you want to try the examples in this chapter, you will need to install and configure Tcl/Tk (version 8.0 or later) and libpgtcl.
If you are running on a Linux host, the chances are good that you already have Tcl/Tk installed on your system. To find out whether Tcl is ready to use, enter the command tclsh, as shown here:
$ tclsh % exit $
If you see the % prompt, you have Tcl installed on your system. If instead, you see an error such as “tcl: command not found,” you may still have a copy of Tcl installed on your system, but it's not in your search path ($PATH)—ask your system administrator whether Tcl is available.
If you find that you need to install Tcl, you can find it at http://tcl._activestate.com. ActiveState distributes ...
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