SHELL

chmod

chmod u=rwx,g=rx,o=r <file>	# Set the rights to -rwxr-xr--
chmod o-r <file>			# Remove 'read' from others
chmod g+w <file>			# Add 'write' to group

chmod -R 754 <directory>	# Set the rights to -rwxr-xr-- recursive

┌─────┬─────┬─────┐
│ r-- │ -w- │ --x │
│  4  │  2  │  1  │
├─────┼─────┼─────┼─────┐
│ rw- │ r-x │ -wx │ rwx │
│  6  │  5  │  3  │  7  │
└─────┴─────┴─────┴─────┘

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

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."

chmod

For changing permissions mode of files as "file.exe" follow next examples idea:
chmod file.exe ugo+x #Add x:execute permissions to u:user g:gropu and o:others
chmod file.exe o-rw  #Remove r:read and w:write permissions to o:others
chmod file.exe +rwx  #Add all r:read, w:wirte and x:execute permissions to all.

chmod

chmod file.exe +rwx 
chmod -R 777 ./

chmod

chmod -R 777 diretorio