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How do you do a simple “chmod +x” from within python?
... asking about "chmod +x" which makes it executable across the board (user, group, world)
– eric.frederich
Aug 13 '13 at 14:11
35
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Delete duplicate rows from small table
...tting executed N times (for all N rows in the dupes table) rather than the grouping that's going on in the other solution.
– David
Sep 12 '17 at 12:36
...
Remove all classes that begin with a certain string
... id="a" that may have any number of classes attached to it, from several groups. Each group has a specific prefix. In the javascript, I don't know which class from the group is on the div. I want to be able to clear all classes with a given prefix and then add a new one. If I want to remove all of...
Join vs. sub-query
...moo, bar
FROM foo
LEFT JOIN (
SELECT MIN(bar), me FROM wilco GROUP BY me
) ON moo = me
This is interesting. We combine JOIN with a sub-query. And here we get the real strength of sub-queries. Imagine a dataset with millions of rows in wilco but only a few distinct me. Instead of ...
C/C++ include header file order
...es of:
Include system headers first (stdio.h, etc) with a dividing line.
Group them logically.
In other words:
#include <stdio.h>
#include <string.h>
#include "btree.h"
#include "collect_hash.h"
#include "collect_arraylist.h"
#include "globals.h"
Although, being guidelines, that'...
How to schedule a task to run when shutting down windows
...
WARINING: The group policy startup and shutdown scipts not executed, when using fastboot (enabled by default in windows 8 and up). In this case, only the restart or force shutdown (from command prompt) shut down really the computer. In all...
Should everything really be a bundle in Symfony 2.x?
... Model in this case, for example, Model:User.
You can use subnamespaces to group related entities together, for example, src/Vendor/User/Group.php. In this case, the entity's name is Model:User\Group.
Keeping controllers out of bundles
First, you need to tell JMSDiExtraBundle to scan the src folder ...
How to test valid UUID/GUID?
...bove regex to meet the requirements of the original question.
HINT: regex group/captures
To avoid matching NIL UUID:
/^[0-9a-f]{8}-[0-9a-f]{4}-[1-5][0-9a-f]{3}-[89ab][0-9a-f]{3}-[0-9a-f]{12}$/i
share
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How to find and return a duplicate value in array
... the first option being the fastest:
ary = ["A", "B", "C", "B", "A"]
ary.group_by{ |e| e }.select { |k, v| v.size > 1 }.map(&:first)
ary.sort.chunk{ |e| e }.select { |e, chunk| chunk.size > 1 }.map(&:first)
And a O(N^2) option (i.e. less efficient):
ary.select{ |e| ary.count(e) &...
What are the differences between LinearLayout, RelativeLayout, and AbsoluteLayout?
...in a single column or a single row.
Relative Layout: This layout is a view group that displays child views in relative positions.
Table Layout: A layout that arranges its children into rows and columns.
More Information:
FrameLayout
FrameLayout is designed to block out an area on the screen to di...