Convert Text into Hexadecimal and Hexadecimal into Text on command line

Convert Text into Hexadecimal using command line :
printf "linux is awesome" | xxd


echo -n "linux is awesome" | od -A n -t x1

Convert Hexadecimal into Text using command line:
echo "6c 69 6e 75 78 20 69 73 20 61 77 65 73 6f 6d 65" | xxd -r -p && echo ""

No PostgreSQL clusters exist; see "man pg_createcluster"

Solution :

Run commands :
dpkg-reconfigure locales

pg_createcluster 9.3 main --start
pg_createcluster 9.4 main --start
pg_createcluster 9.5 main --start
(depends on your postgresql version.)

Ubuntu Apache php error : Class 'NumberFormatter' not found

Solution :

Install Package :
apt-get install php5-intl
apt-get install php-intl

Make sure file is generated and it is defined as an extension in .ini file.
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