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Include all existing fields and add new fields to document
...ne a $project aggregation stage where I can instruct it to add a new field and include all existing fields, without having to list all the existing fields.
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When should I use git pull --rebase?
I know of some people who use git pull --rebase by default and others who insist never to use it. I believe I understand the difference between merging and rebasing, but I'm trying to put this in the context of git pull . Is it just about not wanting to see lots of merge commit messages, or are...
Get yesterday's date in bash on Linux, DST-safe
I have a shell script that runs on Linux and uses this call to get yesterday's date in YYYY-MM-DD format:
10 Answers
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A variable modified inside a while loop is not remembered
...I'm using some sort of copy of the variable $foo inside the while loop and I am modifying only that particular copy. Here's a complete test program:
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What are the differences between Rust's `String` and `str`?
Why does Rust have String and str ? What are the differences between String and str ? When does one use String instead of str and vice versa? Is one of them getting deprecated?
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Clean way to launch the web browser from shell script?
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xdg-open is standardized and should be available in most distributions.
Otherwise:
eval is evil, don't use it.
Quote your variables.
Use the correct test operators in the correct way.
Here is an example:
#!/bin/bash
if which xdg-open...
Fast way to discover the row count of a table in PostgreSQL
...IN pg_namespace n ON n.oid = c.relnamespace
WHERE c.relname = 'mytable'
AND n.nspname = 'myschema'
Or better still
SELECT reltuples::bigint AS estimate
FROM pg_class
WHERE oid = 'myschema.mytable'::regclass;
Faster, simpler, safer, more elegant. See the manual on Object Identifier Type...
Replace only text inside a div using jquery
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Find the text nodes (nodeType==3) and replace the textContent:
$('#one').contents().filter(function() {
return this.nodeType == 3
}).each(function(){
this.textContent = this.textContent.replace('Hi I am text','Hi I am replace');
});
Live example: h...
Understanding the meaning of the term and the concept - RAII (Resource Acquisition is Initialization
...rs please give us a good description of what RAII is, why it is important, and whether or not it might have any relevance to other languages?
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windows service vs scheduled task
What are the cons and pros of windows services vs scheduled tasks for running a program repeatedly (e.g. every two minutes)?
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