File Permissions

To add write permission for the group on a file called "file1":

type: chmod g+w file1

To remove read and write permission for the group and others on "file1":

type: chmod go-rw file1

To make "file1" and "file2" executable for yourself:

type: chmod u+x file1 file2

To deny the group and others cd permission to the directory "direct1":

type: chmod go-x direct1

To do several steps at once:

Remove read and write permission on file1 for others, add write permission for the group:

type: chmod g+w,o-rw file1