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  Linux administrator. Bash script for create file if not exist. #bash #shell #linux #linuxadministrator #script #stream #sql #postgres #postgresql #dba #programming #backend    

  Postgresql Reporting. How to create html reporting by psql command and sql command file txt. An example. #postgres #postgresql #database #dba #backend #stream #bigdata #linux #reporting #businessintelligence #html #report #psql    

  Linux sed command. Another use fo sed, i need delete first two character in my python code. #python #sed #backend #linux #linuxadministrator #awk #dba #stream #bigdata #programming #unix #postgres #postgresql #sql

  Penetration Testing, Cyber security. How to test an web server, with tool telnet and command 'HEAD'. Retrieve information. Example. #penetrationetesting #penetrationetester #vapt #cybersecurity #ethicalhacker #linux #hacking #telnet #oldhacker #network #malware #shellcode #exploit 

  C language. How to use a math function and operations mathematical, with through parameters. #gcc #c #unix #linux #math #methematics #backend #programming #ethcalhacker

  Linux administration. Chown command. ‘chown’ changes the user and/or group ownership of each given FILE to NEW-OWNER or to the user and group of an existing reference file. an example. #linux #linuxadministrator #chown #backend #bigdata #stream #sql #database #postgresql #ethicalhacker #cybersecurity

  Postgresql. Understanding transactions. Transaction is a set of one or more SQL statements that take the database from one consistent state to another. #postgresql #postgres #dba #database #sql #backend #stream #bigdata