大约有 45,062 项符合查询结果（耗时：0.0415秒） [XML]
Check existence of input argument in a Bash shell script
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It is:
if [ $# -eq 0 ]
then
echo "No arguments supplied"
fi
The $# variable will tell you the number of input arguments the script was passed.
Or you can check if an argument is an empty string or not like:
if [ -z "$1...
Fastest way to get the first object from a queryset in django?
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edited Jul 28 at 21:01
Boris
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Visualizing branch topology in Git
I'm playing with Git in isolation on my own machine, and I find it difficult to maintain a mental model of all my branches and commits. I know I can do a git log to see the commit history from where I am, but is there a way to see the entire branch topography, something like these ASCII maps that ...
Is it safe to check floating point values for equality to 0?
I know you can't rely on equality between double or decimal type values normally, but I'm wondering if 0 is a special case.
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Could not load file or assembly 'Newtonsoft.Json' or one of its dependencies. Manifest definition do
...wing from my web.config:
<dependentAssembly>
<assemblyIdentity name="Newtonsoft.Json" publicKeyToken="30ad4fe6b2a6aeed" culture="neutral" />
<bindingRedirect oldVersion="0.0.0.0-6.0.0.0" newVersion="6.0.0.0" />
</dependentAssembly>
If you want to ensure all you...
Why isn't String.Empty a constant?
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The reason that static readonly is used instead of const is due to use with unmanaged code, as indicated by Microsoft here in the Shared Source Common Language Infrastructure 2.0 Release. The file to look at is sscli20\clr\src\bcl\system\string.cs.
The Empty constant holds the empty
string ...
Converting from a string to boolean in Python?
... do convert from a string to a boolean in Python? I found this link . But it doesn't look like a proper way to do it. I.e. using built-in functionality, etc.
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Difference between core and processor
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A core is usually the basic computation unit of the CPU - it can run a single program context (or multiple ones if it supports hardware threads such as hyperthreading on Intel CPUs), maintaining the correct program state, registers, and correct execution order, and p...
jquery data selector
...new data selector that should enable you to do nested querying and AND conditions. Usage:
$('a:data(category==music,artist.name==Madonna)');
The pattern is:
:data( {namespace} [{operator} {check}] )
"operator" and "check" are optional. So, if you only have :data(a.b.c) it will simply check f...
When and why to 'return false' in JavaScript?
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Often, in event handlers, such as onsubmit, returning false is a way to tell the event to not actually fire. So, say, in the onsubmit case, this would mean that the form is not submitted.
s...