LINUX COMMANDS - PERMISSIONS

 

Complete table of chmod numbers
Number	Permission	Sum
0	– – –	0+0+0
1	– – x	0+0+1
2	– w –	0+2+0
3	– w x	0+2+1
4	r – –	4+0+0
5	r – x	4+0+1
6	r w –	4+2+0
7	r w x	4+2+1

https://linuxize.com/post/chmod-command-in-linux/

CHECK THE FILE’S PERMISSIONS IN THE NUMERIC NOTATION:

$ stat -c "%a" filename

$ chmod 644 dirname

$ chmod -R 700 dirname

$ chmod -R 755 /var/www            <<= recursively applies to all files & subdirectories

CHANGING FILE PERMISSIONS IN BULK

Using the numeric method:

$ find /var/www/my_website -type d -exec chmod 755 {} \;

$ find /var/www/my_website -type f -exec chmod 644 {} \;

Using the symbolic method:

$ find /var/www/my_website -type d -exec chmod u=rwx,go=rx {} \;

$ find /var/www/my_website -type f -exec chmod u=rw,go=r {} \;