Firstly install jpegoptim.
You can do this on Debian like systems using apt:
sudo apt-get update && sudo apt-get install jpegoptim
Then go to directory with jpeg files and use this command:
find . -name '*.jpg' -exec jpegoptim -m70 -o -f --strip-all {} \;
It will find all jpg files recursively and optimize with following settings:
That’s easy:
find ./ -depth -exec rename -v 's/[^[:ascii:]]/_/g' {} \; | cat -vI’ve previously posted a note about finding Raspberry Pi without knowing it’s ip address. Well, basically it’s the same… Only you need to change MAC prefix to find other manufacturer. To wrap this is up, this is a command to find device by MAC prefix:
sudo nmap -sP 192.168.100.0/24 | awk '/^Nmap/{ip=$NF}/00:D0:23/{print ip}'And here you can find actual MAC information (use CTRL+F).
Of course you need Nmap to do that! And sudo is necessary!
Beware that sometimes there might be many prefixes for one manufacturer. Also check company name precisely, for example HP is Hewlett Packard but it also can be ProCurve Networking by HP.
If you want to archive your project quickly with additional MySQL dump you can use this simple Bash script.
Continue reading Simple backup script for your web projects
If you’ll ever have problem with opening (fopen) and reading (fread) files larger than 2 GB in your PHP script. Check your version of scripting engine. In my case switching to 64 bit solved the problem. Please mind that this error is very hard to debug because PHP does not log anything (same as MS IIS) in such case. It simply resets client connection…
This is really quick tip (cmd commands):
dsquery user -limit 10000 | find /c /i "OU="
To count users.
dsquery computer -limit 10000 | find /c /i "OU="
Here you can find how to create paths.
In this example I will show you how to view Yii framework based app log and MySQl queries, both in realtime. Continue reading How to view two logs in one window?
You must provide proper database name and user:
File: gistfile1.txt
-------------------
psql -c "SELECT pg_database.datname, pg_database_size(pg_database.datname), pg_size_pretty(pg_database_size(pg_database.datname)) FROM pg_database ORDER BY pg_database_size DESC;" -d
When you want to find your headless but networked Raspberry Pi and you’re lazy like me use nmap:
sudo nmap -sP 192.168.1.0/24 | awk '/^Nmap/{ip=$NF}/B8:27:EB/{print ip}'
Mask /24 means that addresses from 192.168.1.0 to 192.168.1.254 will be searched. You can extend that to /16 if you don’t know subnet of your device.
One of my company’s WordPress installations has been hacked by Turkish hackers recently. After quick investigation I’ve found that script version was little bit old (not a very popular website, mea culpa, not updated very often). In case you didn’t know, WordPress is bundled with readme file by default. I’ve found that malicious scripts or people use that to determine your version’s branch. So I’ve decided to Troll them a little bit… Continue reading How to obscure your WordPress version and troll the attacker a little…