Cook
Give user write access
chmod u+w /usr/local/share/zsh
Multiple users/groups
chmod g+w,o-rw,a+x ~/example-files/
Apply recursively to all children files/directories
chmod -R ...
Apply permissions set rwxr-xr-x
chmod 755 test.txt
chmod u+w /usr/local/share/zsh
chmod g+w,o-rw,a+x ~/example-files/
chmod -R ...
rwxr-xr-x
chmod 755 test.txt