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Renaming files in a folder to sequential numbers
... let, and printf for the padding:
a=1
for i in *.jpg; do
new=$(printf "%04d.jpg" "$a") #04 pad to length of 4
mv -i -- "$i" "$new"
let a=a+1
done
using the -i flag prevents automatically overwriting existing files.
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How to change value of process.env.PORT in node.js?
...
You can use cross platform solution https://www.npmjs.com/package/cross-env
$ cross-env PORT=1234
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How to permanently export a variable in Linux?
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Immediately apply all changes:
source ~/.bash_profile
Source: https://www.serverlab.ca/tutorials/linux/administration-linux/how-to-set-environment-variables-in-linux/
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Recursively list all files in a directory including files in symlink directories
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find -L /var/www/ -type l
# man find
-L Follow symbolic links. When find examines or prints information about files, the information used shall be taken from the
properties of
the file to which the link poi...
How do I read the source code of shell commands?
...he coreutils package.
You can find all information you need here:
http://www.gnu.org/software/coreutils/
If you want to download the latest source, you should use git:
git clone git://git.sv.gnu.org/coreutils
To install git on your Ubuntu machine, you should use apt-get (git is not included in ...
What's the difference between disabled=“disabled” and readonly=“readonly” for HTML form input fields
...led form, while read-only can still be highlighted (and copied).
http://www.w3schools.com/tags/att_input_disabled.asp
http://www.w3schools.com/tags/att_input_readonly.asp
A read-only field cannot be modified. However, a user can tab to it, highlight it, and copy the text from it.
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Bootstrap NavBar with left, center or right aligned items
... </li>
</ul>
</div>
</nav>
http://www.codeply.com/go/qhaBrcWp3v
Another BS4 Navbar option with center links and overlay logo image:
<nav class="navbar navbar-expand-lg navbar-dark bg-dark">
<div class="navbar-collapse collapse w-100 dual-co...
Twitter oAuth callbackUrl - localhost development
... assumes that you are registering two apps with Twitter, one for your live www.mysite.com and another for 127.0.0.1.
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Bootstrap 3.0 - Fluid Grid that includes Fixed Column Sizes
... I have written up a short guide with a more general use case here https://www.atlascode.com/bootstrap-fixed-width-sidebars/. Hope it helps.
The bootstrap3 grid system supports row nesting which allows you to adjust the root row to allow fixed width side menus.
You need to put in a padding-left on...
Scaling Node.js
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server 127.0.0.1:8003;
}
server {
listen 80;
server_name www.domain.com;
location / {
proxy_pass http://myproject;
}
}
}
Redis
20 queries per second
No sweat for node.js. You should use redis as your datastore because it is insane fast :). There is even a c ...