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How to find Unused Amazon EC2 Security groups
...ecided to write my own script. I used the AWS CLI, MySQL and some “Bash-foo” to perform the following:
Get a list of all EC2 security groups.
I store the group-id, group-name and description in a tabled called “groups” in a MySQL database called aws_security_groups on the localhost. The ...
HTML table with fixed headers?
...
<thead>
<tr>
<th>Foo</th>
<th>Bar</th>
</tr>
</thead>
<tbody>
<tr><td></td><td></td></tr>
<tr...
Clone private git repo with dockerfile
... with sed or similar, i.e. calling the script with sh rundocker.sh MYTOKEN=foo which would replace on https://{{MY_TOKEN}}@github.com/user-or-org/repo. Note that you could also use a configuration file (in .yml or whatever format you want) to do the same thing but with environment variables.
Create ...
Object reference not set to an instance of an object.Why doesn't .NET show which object is `null`?
...method calls (unless of course you allow the null reference):
public void Foo(String s) {
if (s == null)
throw new ArgumentNullException("s");
Console.WriteLine(s.Length);
}
If null is passed to the method you get an exception that precisely describes what the problem is (that s is null)....
memory_get_peak_usage() with “real usage”
...able or specific section of PHP is:
$start_memory = memory_get_usage();
$foo = "Some variable";
echo memory_get_usage() - $start_memory;
See Explanation, but if you are in a loop or recursive function you can use maximum memory usage to estimate safely when memory peek would be reached.
Example...
Why does struct alignment depend on whether a field type is primitive or user-defined?
In Noda Time v2, we're moving to nanosecond resolution. That means we can no longer use an 8-byte integer to represent the whole range of time we're interested in. That has prompted me to investigate the memory usage of the (many) structs of Noda Time, which has in turn led me to uncover a slight ...
Why is a round-trip conversion via a string not safe for a double?
Recently I have had to serialize a double into text, and then get it back. The value seems to not be equivalent:
3 Answers
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How to create a unique index on a NULL column?
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for reference in 2008 on you can do CREATE UNIQUE INDEX foo ON dbo.bar(key) WHERE key IS NOT NULL;
– niico
May 3 '17 at 16:06
2
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JavaScript: Class.method vs. Class.prototype.method
...y class property resolves to b.__proto__.constructor and thereby points to Foo.
– Bob Stein
Jul 9 at 17:07
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