disable root and disable password $ sudo vim /etc/ssh/sshd_config
PasswordAuthentication no
PermitRootLogin no
$ sudo service ssh restart
$ cat /etc/passwd |grep /bin/bash |grep [5-9][0-9][0-9] |cut -d: -f1 # user list: Add a new user$ adduser morteza
Set password: $ passwd morteza
$ passwd # for current user
: $ su - morteza
User is not in the sudoers file
Modify sudoers at /etc/sudoers
Uncomment the line under "Allow people in group wheel to run all commands"
Add current user to wheel group
OR $ usermod -a -G sudo morteza
make a new group
$ gpasswd -a morteza mygroup # add existing user morteza to the group mygroup $ gpasswd -d user group # remove existing user morteza from the group mygroup
$ groups morteza # groups a user belongs to
$ chown -Rv username someFileOrDir # the user own the directory. v verbose will tell you what happened and what didn't, The verbose mode is especially useful if you change the ownership of several files at once.
$ chgrp -Rv usergroup somedir # change the group of a directory
To make sure that group ownership is inherited on future files - to avoid future unwanted permission denied calls:
chmod -R g+s /tmp/mytemp*
Create a shared directory for all users$ sudo groupadd users-share # Make sure all the users who need write access to /var/www are in this group.
$ sudo usermod -a -G users-share morteza # for each user
$ sudo usermod -a -G users-share scidb
$ sudo mkdir /home/users-share
$ sudo chgrp -R users-share /home/users-share/ # Then set the correct permissions on /var/www.
$ sudo chmod -R g+wx /home/users-share/
$ sudo find /home/users-share/ -type d -exec chmod 2775 {} \; # Additionally, you should make the directory and all directories below it "set GID", so that all new files and directories created under /var/www are owned by the www-data group.
$ sudo find /home/users-share/ -type f -exec chmod ug+rw {} \; # Find all files in /var/www and add read and write permission for owner and group:
#login again to be able to use this change in permissions
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