Linux chmod permissions

Debian give write permission

sudo chmod -R 757 /var/www

Linux chmod permissions

The three rightmost digits define permissions for the:
file user, the group, and others. 

#	Permission				rwx	Binary
7	read, write and execute	rwx	111
6	read and write			rw-	110
5	read and execute		r-x	101
4	read only				r--	100
3	write and execute		-wx	011
2	write only				-w-	010
1	execute only			--x	001
0	none					---	000

Permission in linux

chmod u=rwx,g=rw,o=rx myfile.txt
Now view the result:
ls -l myfile.txt
-rwxrw-r-x 1 user group 9482 Jan 16 16:29 myfile.txt 
//where frist character represent wheather it is directory or file 
//  'd' for directory and '-' file

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