From Tcl you need to use either exec, or
open
with a command pipeline (e.g., '
[open "|ls -l"]').
Depending on exactly what you want to accomplich, one or the other may
work better for you. Typically you want exec.
If the command line want to use is dynamically constructed or
otherwise complicated, you may also want to use eval in constructing
it. But it's either exec or open that you need to do the actual work
of running the executable.
If you're new to Tcl, there are some subtleties to making best use of
exec, open, and eval that will not be obvious or even clear
to you at first (e.g., using a catch around programs that write to
stdout, or dynamic construction of command lines), but basic use of
exec is simple and straightforward.
