# Other

## Cyta – soeasy Pay As You Go

To check the remaining balance and the expiration date of your SIM card, type `*110#` and press call/dial.
To find out the current information on your bonuses (e.g. free SMS) type `*110*1#` and then press call/dial.

## PrimeTel – Pay As You Go Kartokiniti

To find out your account balance and expiration date, type `*133#` and press call/dial.
To find out the remaining balance of your bonus, type `*140#` and press call/dial.

## MTN – Pay As You Go

You can find out what your available balance is and when will your subscription expire by typing `*202#` and then pressing call/dial.

## Logarithm is the inverse operation to exponentiation

In mathematics, the logarithm is the inverse operation to exponentiation, just as division is the inverse of multiplication and vice versa. That means the logarithm of a number is the exponent to which another fixed number, the base, must be raised to produce that number. In the most simple case the logarithm counts repeated multiplication of the same factor; e.g., since `1000 = 10 × 10 × 10 = 103`, the “logarithm to base 10” of 1000 is 3. More generally, exponentiation allows any positive real number to be raised to any real power, always producing a positive result, so the logarithm can be calculated for any two positive real numbers `b` and `x` where `b` is not equal to `1`. The logarithm of `x` to base `b`, denoted `logb (x)` (or `logb x` when no confusion is possible), is the unique real number `y` such that `by = x`. For example, `log2 64 = 6`, as `64 = 26`.

From: https://en.wikipedia.org/wiki/Logarithm

Another example: When `N = ax` then `x` is equal to `loga (N)` (or `loga N`).

## Regular expression to match any ASCII character

The following `regular expression` will match any `ASCII` character (character values `[0-127]`).

`[\x00-\x7F]`

The next `regular expression` makes the exact opposite match, it will match any character that is `NOT ASCII` (character values greater than `127`).

`[^\x00-\x7F]`

gEdit – regular expression to match any ASCII character

gEdit – regular expression to match any Non-ASCII character

## Facebook gives hints about what a picture contains on the ‘alt’ field

Just a fun fact:

Facebook posts some of the information that it automatically derives from user pictures in the `alt` field of the pictures.
Below we post two samples from a stream that demonstrating this feature:

In the first one we can read in the `alt` the following `Image may contain: 1 person, smiling, closeup`.

In the second one we can read in the `alt` the following `Image may contain: 1 person, sitting, pool, sky and outdoor`.

We can see that in both cases the information is pretty much valid.

## After you connect to the Wi-Fi hot spot of the device (SSID: Phantom_XXXXXX):

### System 1

```ssh [email protected]

BusyBox v1.19.4 (2013-04-22 22:41:57 CST) built-in shell (ash)
Enter 'help' for a list of built-in commands.

-----------------------------------------------------
DJI-INNOVATIONS
-----------------------------------------------------
* FC200-Vision+
* [email protected]
* 02/20/2014
* Version 1.01
* ART / DHCP down / ping
-----------------------------------------------------

```

System is based on OpenWrt.

### System 2

```ssh [email protected]

BusyBox v1.19.4 (2013-04-22 22:41:57 CST) built-in shell (ash)
Enter 'help' for a list of built-in commands.

-----------------------------------------------------
DJI-INNOVATIONS
-----------------------------------------------------
* FC200-Vision+ RE
* [email protected]
* 02/21/2014
* Version 1.01
* ART / DHCP down / ping
-----------------------------------------------------

```
```ssh -L 8080:downloads.openwrt.org:80 [email protected]

```
```cat /etc/opkg.conf
dest root /
dest ram /tmp
lists_dir ext /var/opkg-lists
option overlay_root /overlay

cat /etc/opkg.conf
dest root /
dest ram /tmp
lists_dir ext /var/opkg-lists
option overlay_root /overlay
option http_proxy http://127.0.0.1:8080/

```
```[email protected]:~# opkg update
Updated list of available packages in /var/opkg-lists/barrier_breaker.
[email protected]:~# opkg install tcpdump-mini
Installing tcpdump-mini (4.5.1-4) to root...
Installing libpcap (1.5.3-1) to root...
Configuring libpcap.
Configuring tcpdump-mini.

opkg install tcpdump-mini
Installing tcpdump-mini (4.5.1-4) to root...
Installing libpcap (1.7.4-1) to root...
Configuring libpcap.
Configuring tcpdump-mini.
Collected errors:
* pkg_run_script: package "libpcap" postinst script returned status 127.
* opkg_configure: libpcap.postinst returned 127.
* pkg_run_script: package "tcpdump-mini" postinst script returned status 127.
* opkg_configure: tcpdump-mini.postinst returned 127.

From host machine:
ssh [email protected] tcpdump -i br-lan -s0 -w - port not 22 > dji-wifi-traffic.pcap

ssh [email protected] tcpdump -n -i br-lan -s0 -w - port 2001 > dji.2001.pcap

ip.src==192.168.1.1 || ip.dst==192.168.1.1 ||ip.src==192.168.1.2 || ip.dst==192.168.1.2 || ip.src==192.168.1.10 || ip.dst==192.168.1.10```

System is based on OpenWrt.

## 3GPP Specification #: 25.331 version 14.1.0 – ASN.1 code

Reference: 25.331
Version: 14.1.0
Title: Radio Resource Control (RRC); Protocol specification
Status: Under change control
Type: ASN.1 code for Technical specification (TS)
Initial Planned Release: Release 1999
Website: https://portal.3gpp.org/desktopmodules/Specifications/SpecificationDetails.aspx?specificationId=1180

## Airliner Website Down on Release Day

The website of cobalt.aero was down minutes after release due to misconfiguration of their systems.

The resources of the website were exhausted in minutes, revealing sensitive information as well.

## 2GB επιπλέον χώρος στο GMail

Για να πάρετε δωρεάν 2GB επιπλέον χώρο μπείτε στον έλεγχο ασφαλείας του profile σας μέχρι τις 11 Φεβρουαρίου 2016 (αύριο) και ολοκληρώστε την διαδικασία.

Διαρκεί μόνο 2 λεπτά και 2GB επιπλέον χώρος θα γίνουν δικά σας!

Αυτή η κίνηση έγινε επ’ευκαιρίας της ημέρας ασφαλής χρήσης του διαδικτύου.

## Ημερίδα Πληροφορικής 2016

7η Ημερίδα Πληροφορικής για μαθητές/τριες Λυκείων και Τεχνικών Σχολών

Ο βασικός στόχος της Ημερίδας Πληροφορικής είναι να ενημερώσει, να διαφωτίσει, αλλά κυρίως να ενθαρρύνει τους νέους μας να ανακαλύψουν τις ευκαιρίες εκπαίδευσης στην Επιστήμη της Πληροφορικής καθώς και να πληροφορηθούν για τις επαγγελματικές προοπτικές που προσφέρει η επιστήμη αυτή. Η ημερίδα στοχεύει κυρίως στους μαθητές της Α’ τάξης Λυκείων και Τεχνικών Σχολών, οι οποίοι βρίσκονται στο κρίσιμο στάδιο της
επιλογής των επόμενων μεταλυκειακών βημάτων τους. Η ημερίδα ευελπιστεί ότι θα βοηθήσει τους συμμετέχοντες να αποκτήσουν μια καλύτερη άποψη για την Επιστήμη της Πληροφορικής. Την προσπάθειά μας αυτή ενισχύει το Υπουργείο Παιδείας και Πολιτισμού καθώς και ο Κυπριακός Σύνδεσμος Πληροφορικής (Cyprus Computer Society – CCS).

## Most traded currencies by value (December 2015)1

Currency distribution of global foreign exchange market turnover
Rank Currency ISO 4217 code
(Symbol)
% daily share
(December 2015)
1
United States dollar
USD (\$)
87.0%
2
Euro
EUR (€)
33.4%
3
Japanese yen
JPY (¥)
23.0%
4
Pound sterling
GBP (£)
11.8%
5
Swiss franc
CHF (CHF)
8.6%
6
5.2%
7
Australian dollar
AUD (\$)
4.6%
8
Mexican peso
MXN (\$)
2.5%
9
Chinese yuan
CNY (¥)
2.2%
10
New Zealand dollar
NZD (\$)
2.0%
11
Swedish krona
SEK (kr)
1.8%
12
Russian ruble
RUB (₽)
1.6%
13
Hong Kong dollar
HKD (\$)
1.4%
14
Norwegian krone
NOK (kr)
1.4%
15
Singapore dollar
SGD (\$)
1.4%
16
Turkish lira
TRY (₺)
1.3%
17
South Korean won
KRW (₩)
1.2%
18
South African rand
ZAR (R)
1.1%
19
Brazilian real
BRL (\$)
1.1%
20
Indian rupee
INR (₹)
1.0%
Other 6.3%
Total 200%