I frequently need a command to only run by one process at a time. Most of the time this command would be invoked by a cronjob, but it would not have finished by the time the crontab executes this command again (think long imports and such).

It's fairly easy to fix this by setting a pidfile, and checking for existence (and running process), but it's tedious to do this, and I think it would be a nice feature to implement a "isSingleProcess" method in your command, or something, to accomplish this.

I have implemented this myself, and so if this is a desired feature, I can attach some code to this issue. Also, I'm not really sure what the technical term for this is (it's not a daemon, but I don't know how this is commonly called).