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Question		Answer
Remove rights to write in a file for the file owner start learning		chmod u-w myfile
Remove rights to read in a file for the file owner start learning		chmod u-r myfile
Add rights to read and write in a file for the file owner start learning		chmod u+rw myfile
Remove rights to read in a file for the owner, group and others start learning		chmod -r myfile
Remove rights to write in a file for the owner, group and others start learning		chmod -w myfile
How to add group in the system? start learning		groupadd finance
How to list all groups? start learning		getent group or cat /etc/group
How to change owner for the file or catalog start learning		chown user: group file or directory
Remove rights to write in a file for the group start learning		chmod g-w myfile
Remove rights to read in a file for the group start learning		chmod g-r myfile
Add rights to read and write in a file for the group start learning		chmod g+rw myfile
Remove rights to write in a file for the others start learning		chmod o-w myfile
Remove rights to read in a file for the others start learning		chmod o-r myfile
Add rights to read and write in a file for the others start learning		chmod o+rw myfile
How to add user to the group start learning		usermod -G finance user // relog to enable access to finance
How to remove execute rights on files? start learning		chmod ug-x -R finance
How to remove execute rights on directories? start learning		chmod ug+X -R finance
How to add rights for all: owner, group and others for the file? start learning		chmod a+r test1
What is setgid start learning		permission bit - gives permission as a group
What is setuid start learning		permission bit - gives permission as a user
How to add setgid? start learning		chmod g+s test1

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