[SQL] How to find space occupied by postgres on harddisk

Hello,
Myself Dipesh Mistry from Ahmedabad India.
I want to know that if i dump the 5GB sql file then how many space does
postgres occupy on harddisk.
Is there any calculation is available?
Or any postgres command can give us this type of information?
Thank you.

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With Warm Regards,
Dipesh Mistry
Information Technology Dept.
GaneshaSpeaks.com

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