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How to filter None's out of List[Option]?
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How do I access the command history from IDLE?
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Grep for literal strings
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How do I update all my CPAN modules to their latest versions?
...cpanm
I recommend you install cpanminus like the docs describe:
curl -L https://cpanmin.us | perl - App::cpanminus
And then install cpan-outdated along with all other CPAN modules using cpanm:
cpanm App::cpanoutdated
BTW: If you are using perlbrew then you will need to repeat this for every ...
ipython notebook clear cell output in code
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Vagrant ssh authentication failure
...efault to ssh-connect you may simply use
user: vagrant password: vagrant
https://www.vagrantup.com/docs/boxes/base.html#quot-vagrant-quot-user
First, try: to see what vagrant insecure_private_key is in your machine config
$ vagrant ssh-config
Example:
$ vagrant ssh-config
Host default
HostN...
When to add what indexes in a table in Rails
...te and update each record, because it has to rebuild each index.
Credit:
https://tomafro.net/2009/08/using-indexes-in-rails-choosing-additional-indexes, rails - created_at when user for ordering, Should you add an Index to the table?, and the answers above.
...
Comparing Timer with DispatcherTimer
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python pip: force install ignoring dependencies
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Using FileSystemWatcher to monitor a directory
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