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In Jinja2, how do you test if a variable is undefined?
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From the Jinja2 template designer documentation:
{% if variable is defined %}
value of variable: {{ variable }}
{% else %}
variable is not defined
{% endif %}
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Possible to perform cross-database queries with PostgreSQL?
...ions this old are no longer supported, but if you need to do this in a pre-2013 Postgres installation, there is a function called dblink.
I've never used it, but it is maintained and distributed with the rest of PostgreSQL. If you're using the version of PostgreSQL that came with your Linux distro,...
Serving favicon.ico in ASP.NET MVC
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205
Placing favicon.ico in the root of your domain only really affects IE5, IIRC. For more modern ...
how perform grep operation on all files in a directory
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237
grep $PATTERN * would be sufficient. By default, grep would skip all subdirectories. However, ...
Check if a Windows service exists and delete in PowerShell
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238
You can use WMI or other tools for this since there is no Remove-Service cmdlet until Powershe...
Do while loop in SQL Server 2008
Is there any method for implement do while loop in SQL server 2008?
5 Answers
5
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What should a Multipart HTTP request with multiple files look like? [duplicate]
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2 Answers
2
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Retrieve a single file from a repository
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21 Answers
21
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What is the difference between $(command) and `command` in shell programming?
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280
The backticks/gravemarks have been deprecated in favor of $() for command substitution because...
How to use ssh agent forwarding with “vagrant ssh”?
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I'm using vagrant 2 on OS X Mountain Lion.
Vagrant.configure("2") do |config|
config.ssh.private_key_path = "~/.ssh/id_rsa"
config.ssh.forward_agent = true
end
config.ssh.private_key_path is your local private key
Your private key must...