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/etc/apt/sources.list" E212: Can't open file for writing
...
That happens to me all the time, I open a root file for writing:
Instead of losing all your changes and re-opening with sudo. See this demo of how to save those changes:
One time Setup demo to create a root owned read only file for a lower user:
sudo touch temp.t...
How to get the root dir of the Symfony2 application?
What is the best way to get the root app directory from inside the controller? Is it possible to get it outside of the controller?
...
What is the difference between trie and radix trie data structures?
... "smiled", "smiles" and "smiling" using the following static assignments:
root['s']['m']['i']['l']['e']['\0'] = smile_item;
root['s']['m']['i']['l']['e']['d']['\0'] = smiled_item;
root['s']['m']['i']['l']['e']['s']['\0'] = smiles_item;
root['s']['m']['i']['l']['i']['n']['g']['\0'] = smiling_item;
...
Convert a series of parent-child relationships into a hierarchical tree?
...that array into a hierarchical tree structure:
function parseTree($tree, $root = null) {
$return = array();
# Traverse the tree and search for direct children of the root
foreach($tree as $child => $parent) {
# A direct child is found
if($parent == $root) {
...
res.sendFile absolute path
...oin(__dirname, '../public', 'index1.html'));
res.sendFile('index1.html', { root: path.join(__dirname, '../public') });
Note: __dirname returns the directory that the currently executing script is in. In your case, it looks like server.js is in app/. So, to get to public, you'll need back out one l...
Open file via SSH and Sudo with Emacs
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/su: or /sudo: on remote hosts
You can also use this syntax to sudo/su to root (or of course any other user) on a remote host:
C-xC-f /ssh:you@remotehost|sudo:remotehost:/path/to/file RET
Important: be sure to specify the hostname explicitly: sudo:remotehost: rather than sudo:: (see below).
As this...
Unable to import a module that is definitely installed
... my case, it is permission problem. The package was somehow installed with root rw permission only, other user just cannot rw to it!
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How do I send a file as an email attachment using Linux command line?
I've created a script that runs every night on my Linux server that uses mysqldump to back up each of my MySQL databases to .sql files and packages them together as a compressed .tar file. The next step I want to accomplish is to send that tar file through email to a remote email server for safek...
Creating a simple XML file using python
...nt using the in-stdlib cElementTree:
import xml.etree.cElementTree as ET
root = ET.Element("root")
doc = ET.SubElement(root, "doc")
ET.SubElement(doc, "field1", name="blah").text = "some value1"
ET.SubElement(doc, "field2", name="asdfasd").text = "some vlaue2"
tree = ET.ElementTree(root)
tree.wr...
CardView layout_width=“match_parent” does not match parent RecyclerView width
...source ID for an XML layout resource to load (e.g.,
R.layout.main_page) root
view to be the parent of the
generated hierarchy (if attachToRoot is true), or else simply an
object that provides a set of LayoutParams values for root of the
returned hierarchy (if attachToRoot is false.)
att...