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How do I edit /etc/sudoers from a script?
...ripts in debian packages. thanks! Since this is always root, it gets short and handy: echo "$CONFIGLINE" | (EDITOR="tee -a" visudo)
– Boris Däppen
Jan 5 '16 at 16:05
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Running PostgreSQL in memory only
...y for this particular question: It's a bad idea to mix with valuable data (and thanks for the warning). For unit-testing with a dedicated DB cluster, a ramdisk is fine.
– Erwin Brandstetter
Jul 12 '15 at 0:32
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Why both no-cache and no-store should be used in HTTP response?
...d response you may have, on every request.
must-revalidate, on the other hand, only needs to revalidate when the resource is considered stale.
If the server says that the resource is still valid then the cache can respond with its representation, thus alleviating the need for the server to resend ...
A simple scenario using wait() and notify() in java
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The wait() and notify() methods are designed to provide a mechanism to allow a thread to block until a specific condition is met. For this I assume you're wanting to write a blocking queue implementation, where you have some fixed size ...
Separation of business logic and data access in django
I am writing a project in Django and I see that 80% of the code is in the file models.py . This code is confusing and, after a certain time, I cease to understand what is really happening.
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Efficient string concatenation in C++
I heard a few people expressing worries about "+" operator in std::string and various workarounds to speed up concatenation. Are any of these really necessary? If so, what is the best way to concatenate strings in C++?
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Parse a .py file, read the AST, modify it, then write back the modified source code
...on source code. Basically I want to read a .py file, generate the AST , and then write back the modified python source code (i.e. another .py file).
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Test for equality among all elements of a single vector
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I use this method, which compares the min and the max, after dividing by the mean:
# Determine if range of vector is FP 0.
zero_range <- function(x, tol = .Machine$double.eps ^ 0.5) {
if (length(x) == 1) return(TRUE)
x <- range(x) / mean(x)
isTRUE(all.eq...
Circle drawing with SVG's arc path
Short question: using SVG path, we can draw 99.99% of a circle and it shows up, but when it is 99.99999999% of a circle, then the circle won't show up. How can it be fixed?
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What is a good reason to use SQL views?
I am reading through the SQL Server 2008 bible and I am covering the views section. But the author really doesn't explain the purpose of views. What is a good use for views? Should I use them in my website and what are the benefits of them?
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