To enter Tcl commands, click in the command line entry box at the bottom of the Tcl Console, and type the commands.
Important: To get input from Tcl using the gets stdin command, you must launch
the Vivado IDE from a command prompt, xterm, or Tcl shell. This ensures that the Vivado
IDE does not hang while waiting for input. Alternatively, you can use the
Vivado <version> Tcl Shell shortcut, and enter the
start_gui command to open the Vivado IDE. When you use the gets
stdin command from the Vivado IDE, the Vivado IDE reads the data entered in the command
prompt, xterm, or Tcl shell.