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How can I add numbers in a Bash script?
...um=$((num1 + 2 + 3)) # ...
num=$[num1+num2] # Old, deprecated arithmetic expression syntax
Using the external expr utility. Note that this is only needed for really old systems.
num=`expr $num1 + $num2` # Whitespace for expr is important
For floating point:
Bash doesn'...
Getting a list of associative array keys
...
You can use: Object.keys(obj)
Example:
var dictionary = {
"cats": [1, 2, 37, 38, 40, 32, 33, 35, 39, 36],
"dogs": [4, 5, 6, 3, 2]
};
// Get the keys
var keys = Object.keys(dictionary);
console.log(keys);
See reference below for browser support. It is supported in Firefox 4....
PDO's query vs execute
...ause I was bulk transferring trusted data from an Ubuntu Linux box running PHP7 with the poorly supported Microsoft ODBC driver for MS SQL Server.
I arrived at this question because I had a long running script for an ETL that I was trying to squeeze for speed. It seemed intuitive to me that query c...
(Deep) copying an array using jQuery [duplicate]
...
similar: var a = [1,2,3]; var b = ([]).concat(a); b is a copy
– Yauhen Yakimovich
May 7 '12 at 15:38
...
How can I exclude one word with grep?
...ed to escape the !):
grep -P '(?!.*unwanted_word)keyword' file
Demo:
$ cat file
foo1
foo2
foo3
foo4
bar
baz
Let us now list all foo except foo3
$ grep -P '(?!.*foo3)foo' file
foo1
foo2
foo4
$
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...
Grasping the Node JS alternative to multithreading
...ache is mentioned in the first place. Additionally, the very commonly used PHP module is multithreaded all by its own. And finally, while I'm not an apache expert, my impression from other articles is that the worker MPM is in fact very commonly used.
– Michael Borgwardt
...
How do I redirect with JavaScript? [duplicate]
... you're using same origin policies like an iframe.
– phpvillain
Mar 17 '16 at 1:40
...
sudo echo “something” >> /etc/privilegedFile doesn't work
...ious, that you can also quote a heredoc (for large blocks):
sudo bash -c "cat <<EOIPFW >> /etc/ipfw.conf
<?xml version=\"1.0\" encoding=\"UTF-8\"?>
<plist version=\"1.0\">
<dict>
<key>Label</key>
<string>com.company.ipfw</string>
...
Remove last character from C++ string
... though (pop_back did not exist in C++03) and it is also an in-place modification (and the OP never clarified whether he wanted in-place or not)... as such, he has a correct answer, but not the only possible one.
– Matthieu M.
May 21 '13 at 6:24
...
Convert timestamp to date in MySQL query
... up as 2018-Nov-6. You may be looking for '%Y-%m-%d' as you'd format it in PHP (date('Y-m-d',$row->user_created_at)) - this (both variants, SQL and PHP) shows up as 2018-11-06
– Chris S.
Nov 7 '18 at 9:19
...