some issues after the development of ZBX-4024 with export_data.sh script

(1) no shebang

(2) uses old fsf mailing address

(3) more parameter quoting would be suggested (for example, on line 4)

(4)
./export_data.sh "z x" - proceeds despite all errors, including mysql errors and :
./export_data.sh: line 29: [: too many arguments

(5) not critical, but uses hardcoded 'root' user - for some better practice at least a variable would be desirable