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How to set environment variable for everyone under my linux system?
...u mind editing this (typo "environEment" in the second to last line, for example) so I can remove the downvote?
– Benjamin W.
Nov 2 '18 at 14:40
add a comment
...
.gitignore exclude files in directory but not certain directories
...s also with each "empty" folders. Later you can ignore these files, they really only exists to make sure that git creates those directories on clone. The entries in .gitignore keeps others files within the folders from being tracked (unless you force it with git add -f ;)).
...
Get month name from Date
..., but on Android, it displays incorrectly (just spits out the entire timestamp).
– hardanger
May 10 '19 at 14:17
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show 3 more comments
...
Rails: What's a good way to validate links (URLs)?
...I.parse method.
require 'uri'
def valid_url?(uri)
uri = URI.parse(uri) && uri.host
rescue URI::InvalidURIError
false
end
You can even decide to make it more restrictive. For instance, if you want the URL to be an HTTP/HTTPS URL, then you can make the validation more accurate.
require '...
Timeout command on Mac OS X?
... -e 'alarm shift; exec @ARGV' "$@";
or a version that has built in help/examples:
timeout.sh
#!/usr/bin/env bash
function show_help()
{
IT=$(cat <<EOF
Runs a command, and times out if it doesnt complete in time
Example usage:
# Will fail after 1 second, and shows non zero exit code ...
When should I use git pull --rebase?
...
Perhaps the best way to explain it is with an example:
Alice creates topic branch A, and works on it
Bob creates unrelated topic branch B, and works on it
Alice does git checkout master && git pull. Master is already up to date.
Bob does git checkout master &...
Ways to circumvent the same-origin policy
...it does so, the shorter domain is used for subsequent origin checks. For example, assume a script in the document at http://store.company.com/dir/other.html executes the following statement:
document.domain = "company.com";
After that statement executes, the page would pass the origin check with ...
Generate a random letter in Python
... there a way to generate random letters in Python (like random.randint but for letters)? The range functionality of random.randint would be nice but having a generator that just outputs a random letter would be better than nothing.
...
C++11 emplace_back on vector?
...T
{
int a;
double b;
string c;
T(int a, double b, string &&c)
: a(a)
, b(b)
, c(std::move(c))
{}
};
vector<T> V;
int main()
{
V.emplace_back(42, 3.14, "foo");
}
The point of using emplace_back is to avoid creating a temporary objec...
For-each over an array in JavaScript
...es and you want to include them in the loop
Looking only at that first example: You can use for-in to visit those sparse array elements if you use appropriate safeguards:
// `a` is a sparse array
var key;
var a = [];
a[0] = "a";
a[10] = "b";
a[10000] = "c";
for (key in a) {
if (a.h...