How to take backup(.bak) in SQL Server on linux

Question

I can not take backup .bak from my database in Linux ubuntu

See this image I want to backup from conn1 database: CarSaleDatabase

I run this

USE CarSaleDatabase
GO 

BACKUP DATABASE CarSaleDatabase
TO DISK = '/home/mohammadsgh/github/ddblab.bak'

but I get this error:

Msg 3201, Level 16, State 1, Line 5 Cannot open backup device '/home/mohammadsgh/github/ddblab.bak'. Operating system error 5(Access is denied.). Msg 3013, Level 16, State 1, Line 5 BACKUP DATABASE is terminating abnormally.

How can I do this?

Answer 1

First step

create .bak file:

touch db.bak

second step:

sudo chmod 777 db.bak