tkinit
This command calls the Tk_Init C function. The purpose of this function
is to allow the stash program to be used in a non windowing
environment. To achieve this the initialisation of Tk has been delayed until
this command is ran. Hence one binary can be used for both text work (no
tkinit call) and graphics work (with a tkinit call).
capture command ?varname?
This command executes command and stores any text written to stdout in the
tcl variable named in varname. If varname is not specified then the
output is returned, otherwise the return codes from the Tcl_Eval
routine are used (ie TCL_OK for success).
For example the command "set x [capture {puts foo}]" and
"capture {puts foo} x" both set x to contain "foo\n".