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Why is whitespace sometimes needed around metacharacters?
...
There is a list of characters that separate tokens in BASH. These characters are called metacharacters and they are |, &, ;, (, ), <, >, space and tab. On the other hand, curly braces ({ and }) are just ordinary characters that make up words.
Omitting the se...
Allow CORS REST request to a Express/Node.js application on Heroku
...problem and the solution was not related to CORS.
Turns out that JSON Web Token secret string was not defined in the environment variables, so the token could not be signed.
This caused to any POST request that relies on checking or signing a token to get a timeout and return a 503 error, telling t...
A Windows equivalent of the Unix tail command [closed]
...cefile=%3
rem *** Get the current line count of file ***
FOR /F "usebackq tokens=3,3 delims= " %%l IN (`find /c /v "" %sourcefile%`) DO (call SET find_lc=%%l)
rem *** Calculate the lines to skip
SET /A skiplines=%find_lc%-!skiplines!
rem *** Display to screen line needed
more +%skiplines% %source...
How can I get the current user's username in Bash?
...e I've used on Solaris 9 and Linux and which works fine for both of them:
ps -o user= -p $$ | awk '{print $1}'
This snippet prints the name of the user with the current EUID.
NOTE: you need Bash as the interpreter here.
On Solaris you have problems with methods, described above:
id does not a...
Symfony 2: How do I check if a user is not logged in inside a template?
...s it results in the following error: No Authentication Provider found for token of class "Symfony\Component\Security\Core\Authentication\Token\PreAuthenticatedToken".
– Harold
Jun 20 '14 at 10:26
...
Nullable vs. int? - Is there any difference?
...hat in the parsing phase after an is (or an as) operator, when we face a ? token we check if the next token can be interpreted as a unary operator (& could be one) and if so: the parser doesn't care about the possibility of the ? token being a type modifier, it simply uses the type before it, an...
What's the algorithm to calculate aspect ratio?
...1% (w x h prevalence% change%)
def __init__(self, steam_line):
tokens = steam_line.split(' ')
self.width = int(tokens[0])
self.height = int(tokens[2])
self.prevalence = float(tokens[3].replace('%', ''))
# This part based on pixdiablo's gcd answer - http:...
How do I drop a MongoDB database from the command line?
...abase()"
More info on scripting the shell from the command line here: https://docs.mongodb.com/manual/tutorial/write-scripts-for-the-mongo-shell/#scripting
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How to change the output color of echo in Linux
...ption:
If you are going to use these codes in your special bash variables
PS0
PS1
PS2 (= this is for prompting)
PS4
you should add extra escape characters so that bash can interpret them correctly. Without this adding extra escape characters it works but you will face problems when you use Ctrl + ...
JavaScript and Threads
...r qs = document.location.search.split('+').join(' ');
var params = {}, tokens, re = /[?&]?([^=]+)=([^&]*)/g;
while (tokens = re.exec(qs)) {
params[decodeURIComponent(tokens[1])] = decodeURIComponent(tokens[2]);
}
return params[paramName];
}
//The thread code (get the...