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How do I change the number of open files limit in Linux? [closed]
...t limits could be set by any user while hard limits are changeable only by root.
Limits are a property of a process. They are inherited when a child process is created so system-wide limits should be set during the system initialization in init scripts and user limits should be set during user login...
Trying to SSH into an Amazon Ec2 instance - permission error
...have a user ubuntu
Amazon's AMI is ec2-user
most Debian images have either root or admin
To login, you need to adjust your ssh command:
ssh -l USERNAME_HERE -i .ssh/yourkey.pem public-ec2-host
HTH
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Dynamic instantiation from string name of a class in dynamically imported module?
...
tl;dr
Import the root module with importlib.import_module and load the class by its name using getattr function:
# Standard import
import importlib
# Load "module.submodule.MyClass"
MyClass = getattr(importlib.import_module("module.submodule...
Parameterize an SQL IN clause
...pe '$'
I prefer this approach to escaping because it works in Oracle and MySQL as well as SQL Server. (I usually use the \ backslash as the escape character, since that's the character we use in regular expressions. But why be constrained by convention!
Those pesky brackets
SQL Server also allo...
Django DB Settings 'Improperly Configured' Error
...
This .py should be placed at the root, which means it is along with manage.py. How do I place it inside random folders?
– anonymous
Jul 11 '19 at 6:54
...
How can I listen for a click-and-hold in jQuery?
...
I wrote some code to make it easy
//Add custom event listener
$(':root').on('mousedown', '*', function() {
var el = $(this),
events = $._data(this, 'events');
if (events && events.clickHold) {
el.data(
'clickHoldTimer',
setTimeou...
How can I find where Python is installed on Windows?
...executable points to the Python binary and exec_prefix to the installation root.
You could also try this for inspecting your sys module:
import sys
for k,v in sys.__dict__.items():
if not callable(v):
print "%20s: %s" % (k,repr(v))
...
How can I define colors as variables in CSS?
...
CSS supports this natively with CSS Variables.
Example CSS file
:root {
--main-color:#06c;
}
#foo {
color: var(--main-color);
}
For a working example, please see this JSFiddle (the example shows one of the CSS selectors in the fiddle has the color hard coded to blue, the other C...
Rails 3 datatypes?
...t by using :limit option with :integer. I have tested it on Rails 3 and MySQL, they are still working, just as said in the blog, they are signed integer.
– RacsO
Dec 18 '13 at 3:23
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how to run two commands in sudo?
...ultiple commands via a shell, for example:
$ sudo -s -- 'whoami; whoami'
root
root
Your command would be something like:
sudo -u db2inst1 -s -- "db2 connect to ttt; db2 UPDATE CONTACT SET EMAIL_ADDRESS = 'mytestaccount@gmail.com'"
If your sudo version doesn't work with semicolons with -s (ap...