chmod 840 info.txt code example

Example 1: chmod

sudo chmod -R 777 name-file-wht-upu-want     ///open for accsess all users 
sudo chmod 644  #for example file /etc/hosts 
https://ss64.com/bash/chmod.html

Example 2: chmod

chmod u=rwx,g=rx,o=r myfile

chmod 754 myfile

# 4 stands for "read",
# 2 stands for "write",
# 1 stands for "execute", and
# 0 stands for "no permission."