Before actually using GUI dialogues, consider using console prompts. Quite often you can get away with simple “y/n?” prompts, which in bash you achieve via the read command.. read -p “Do something? “; if [ $REPLY == “y” ]; then echo yay; fi If console prompt’s just won’t cut it, Zenity is really easy to … Read more
Though you’re running a subsidiary event loop (really don’t do that!) it still shares the same registry of event handlers as the outer loop, so events coming in are handled in the inner loop just as in the outer one. (There’s a common piece of low-level event handling code that reaches deep into the OS … Read more
To make a gridded layout have all columns have the same width, you’ve got to configure those columns to have the same weight and to be in the same uniform group. This configuration is associated with the master widget, not any of the contained widgets (because columns can contain many widgets, of course). In standard … Read more
According to the “How Python Chooses Which Tk Library To Use” section of the “IDLE and tinter with Tcl/Tk on Mac OS X” page on the official python website, The Python for Mac OS X installers downloaded from this website dynamically link at runtime to Tcl/Tk Mac OS X frameworks. The Tcl/Tk major version is … Read more
Use tail’s –pid option and tail will stop when the shell dies. No need to add extra to the tailed file. sh -c ‘tail -n +0 –pid=$$ -f /tmp/foo | { sed “/EOF/ q” && kill $$ ;}’
If you want to wait for jobs to finish, use wait. This will make the shell wait until all background jobs complete. However, if any of your jobs daemonize themselves, they are no longer children of the shell and wait will have no effect (as far as the shell is concerned, the child is already … Read more
The “problem” with expr is that it implements its own “mini language”, which includes, among other things, variable substitution (replacing those $a-s with their values) and command substitution (replacing those [command …] things with the results of running commands), so basically the process of evaluating expr $a + $b goes like this: The Tcl interpreter … Read more
Each Tcl interpreter object (i.e., the context that knows how to run a Tcl procedure) can only be safely used from the OS thread that creates it. This is because Tcl doesn’t use a global interpreter lock like Python, and instead makes extensive use of thread-specific data to reduce the number of locks required internally. … Read more
All Tcl commands need to originate from the same thread. Due to tkinter‘s dependence on Tcl, it’s generally necessary to make all tkinter gui statements originate from the same thread. The problem occurs because mainWindow is instantiated in the tkinterGui thread, but — because mainWindow is an attribute of tkinterGui — is not destroyed until … Read more
A general list for Bindings and Events can be found on effbot.org or in the docs provided by New Mexico Tech whereas the name of several keys are listed here in addition to the original documentation. Here’s a summary of the most common events with some keypress names explained: Event Description <Button-1> Button 1 is … Read more