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How can I check if a string is null or empty in PowerShell?
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One thing to be aware of with PowerShell is that null strings passed to a commandlet or function don't stay null. They get converted to empty strings. See the Microsoft Connect bug at connect.microsoft.com/PowerShell/feedback...
What does @@variable mean in Ruby?
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A variable prefixed with @ is an instance variable, while one prefixed with @@ is a class variable. Check out the following example; its output is in the comments at the end of the puts lines:
class Test
@@shared = 1
def value
@@shared
end
def value=(value)
@@shar...
Git branch strategy for small dev team [closed]
... of code, where code in a less stable branch will eventually "graduate" to one considered more stable after testing and general approval by your team.
Step by step, your workflow under this model might look like this:
You need to fix a bug.
Create a branch called myfix that is based on the develo...
Multiple GitHub Accounts & SSH Config
... needed to make to get this to work. In trying to get two profiles set up, one for personal and one for work, my ~/.ssh/config was roughly as follows:
Host me.github.com
HostName github.com
PreferredAuthentications publickey
IdentityFile ~/.ssh/me_rsa
Host work.github.com
HostName ...
What is the difference between a generative and a discriminative algorithm?
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When staring at the matrices observe that in the first one, all entries sum up to 1.0, while in the second one each row sums up to one. This will speed the enlightenment (and reduce confusion)
– Maxim Khesin
Aug 20 '13 at 17:58
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How to encrypt String in Java
...is to encrypt string which will show up in 2D barcode(PDF-417) so when someone get an idea to scan it will get nothing readable.
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Getting the last argument passed to a shell script
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This is a bit of a hack:
for last; do true; done
echo $last
This one is also pretty portable (again, should work with bash, ksh and sh) and it doesn't shift the arguments, which could be nice.
It uses the fact that for implicitly loops over the arguments if you don't...
How to continue a task when Fabric receives an error
...define a task to run on several remote servers, if the task runs on server one and exits with an error, Fabric will stop and abort the task. But I want to make fabric ignore the error and run the task on the next server. How can I make it do this?
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Swift and mutating struct
...two separated classes for each concept, but in Swift, you can do this with one struct. Half work.
For C/C++ programmers, this is also very familiar concept. This is exactly what const keyword do in C/C++.
Also, immutable value can be very nicely optimised. In theory, Swift compiler (or LLVM) can p...
How to replace multiple strings in a file using PowerShell
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One option is to chain the -replace operations together. The ` at the end of each line escapes the newline, causing PowerShell to continue parsing the expression on the next line:
$original_file = 'path\filename.abc'
$destin...