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Count occurrences of a char in a string using Bash
...{char}" '{print NF-1}' <<< "${string}"
I'm splitting the string by $char and print the number of resulting fields minus 1.
If your shell does not support the <<< operator, use echo:
echo "${string}" | awk -F"${char}" '{print NF-1}'
...
PHP: How to remove all non printable characters in a string?
...in ASCII and UTF-8 because both share the same control set range (as noted by mgutt below). Strictly speaking, this would work without the /u modifier. But it makes life easier if you want to remove other chars...
If you're dealing with Unicode, there are potentially many non-printing elements, but...
Using async-await on .net 4
...dio which is a commercial product. I assume that it is still being offered by Xamarin.
You might also be able to run the required 4.5 profile assemblies from Mono on top of .NET but I have not tried that. The 4.5 profile is a strict super-set of the 4.0 API. Perhaps give it a shot and report back.
...
Pull request vs Merge request
...ject/merge_requests/resolve_conflicts.html
"GitLab resolves conflicts by creating a merge commit in the source
branch that is not automatically merged into the target branch. This
allows the merge commit to be reviewed and tested before the changes
are merged, preventing unintended change...
Check empty string in Swift?
...
Here is how I check if string is blank. By 'blank' I mean a string that is either empty or contains only space/newline characters.
struct MyString {
static func blank(text: String) -> Bool {
let trimmed = text.trimmingCharacters(in: CharacterSet.whitespac...
How to reset Django admin password?
... shell using the command "python manage.py shell".
Import the User Model by typing the following command
"from django.contrib.auth.models import User"
Get all the users by typing the following command
"users = User.objects.all()"
Print a list of the users
For Python 2 users use the command "prin...
Groovy: what's the purpose of “def” in “def x = 0”?
...able here. It's important because you don't ever want to create a variable by accident.
It's somewhat acceptable in scripts (Groovy scripts and groovysh allow you to do so), but in production code it's one of the biggest evils you can come across which is why you must define a variable with def i...
Send attachments with PHP Mail()?
...cause you want the easier option. Trust me, PHPMailer is the easier option by a very large margin compared to trying to do it yourself with PHP's built-in mail() function. PHP's mail() function really isn't very good.
To use PHPMailer:
Download the PHPMailer script from here: http://github.com/PH...
How I can I lazily read multiple JSON values from a file/stream in Python?
...braces, but also pattern match json. It's a sort of json-preparse followed by a json parse. Json is, in comparison to other formats, easy to parse so it's not always necessary to go for a parsing library, nevertheless, how to should we solve these conflicting issues?
Generators to the rescue!
The ...
Ternary operator (?:) in Bash
...to test for the empty string specifically. I like to use the syntaxes used by zsh ('PARAMETER EXPANSION' in the zshexpn manpage) but I don't know much about their portability.
– John P
Feb 23 '18 at 3:31
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