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How to test which port MySQL is running on and whether it can be connected to?
...
grep port /etc/mysql/my.cnf ( at least in debian/ubuntu works )
or
netstat -tlpn | grep mysql
verify
bind-address 127.0.0.1
in /etc/mysql/my.cnf to see possible restrictions
...
Image comparison - fast algorithm
... if a good match is found at the faster level.
file-hash based (md5,sha1,etc) for exact duplicates
perceptual hashing (phash) for rescaled images
feature-based (SIFT) for modified images
I am having very good results with phash. The accuracy is good for rescaled images. It is not good ...
When to use Vanilla JavaScript vs. jQuery?
...round that one: $(this).attr("checked", "checked"), $(this).is(":checked") etc.) and similarly the selected property of <option> elements.
– Tim Down
Jan 10 '11 at 23:01
1
...
How do I run a node.js app as a background service?
...ly every Linux distro comes with systemd, which means forever, monit, PM2, etc are no longer necessary - your OS already handles these tasks.
Make a myapp.service file (replacing 'myapp' with your app's name, obviously):
[Unit]
Description=My app
[Service]
ExecStart=/var/www/myapp/app.js
Restart...
View list of all JavaScript variables in Google Chrome Console
... object (all the functions and variables, e.g., $ and jQuery on this page, etc.). Though, this is quite a list; not sure how helpful it is...
Otherwise just do window and start going down its tree:
window
This will give you DOMWindow, an expandable/explorable object.
...
Using i and j as variables in Matlab
... - use a name that describes the purpose (row_n, elementNo, listItemIndex, etc.). So much easier for someone to understand what you are doing, to debug, etc. The extra time spent is more than worth the gain in long-term maintainability for anything more than a throw-away script - even with the Matl...
SQL query to group by day
...ay AS DAY(Created) PERSISTED
and now you could easily group by, order by etc. by day, month or year of the sale:
SELECT SaleDay, SUM(Amount)
FROM dbo.Sales
GROUP BY SaleDay
Those calculated fields will always be kept up to date (when your "Created" date changes), they're part of your table, the...
How does akka compare to Erlang? [closed]
...TP - Akka integrates with the entire Java ecosystem (Apache Camel, JAX-RS,
etc etc)
Erlang does the process
scheduling for you - Akka allows you
to use many different Dispatchers
with endless configuration
opportunities
Erlang does hot code
reload - Akka can support it, but
it's less flexible becaus...
Check if a string has white space
...hecks for other types of whitespace, not just space (tab, carriage return, etc.)
import some from 'lodash/fp/some'
const whitespaceCharacters = [' ', ' ',
'\b', '\t', '\n', '\v', '\f', '\r', `\"`, `\'`, `\\`,
'\u0008', '\u0009', '\u000A', '\u000B', '\u000C',
'\u000D', '\u0020','\u0022', '\u002...
abort: no username supplied (see “hg help config”)
...Unix, these files are read:
- "<repo>/.hg/hgrc"
- "$HOME/.hgrc"
- "/etc/mercurial/hgrc"
- "/etc/mercurial/hgrc.d/*.rc"
- "<install-root>/etc/mercurial/hgrc"
- "<install-root>/etc/mercurial/hgrc.d/*.rc"
Include the following in one of these files above:
[ui]
username = Your Name...