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Chapter 11. Unix User and Group Management Commands
Chapter 11. Unix User and Group Management Commands
| Command | Description | Command | Description |
| ac | Print statistics about users' connect time. | logname | Print user's login name. |
| accton | Turn on accounting of processes. To turn it on type "accton /var/log/pacct". | newgrp | Lets a suer log in to a new group. |
| adduser | Ex: adduser mark - Effect: Adds a user to the system named mark | newusers | Update and create newusers in batch. |
| chage | Used to change the time the user's password will expire. | passwd | Set a user's pass word. |
| chfn | Change the user full name field finger information | pwck | Verify integrity of password files. |
| chgrp | Changes the group ownership of files. | pwconv | Convert to and from shadow passwords and groups. |
| chown | Change the owner of file(s ) to another user. | quota | Display users' limits and current disk usage. |
| chpasswd | Update password file in batch. | quotaoff or quotaon | Turns system quotas off/on. |
| chroot | Run command or interactive shell with special root directory. | quotacheck | Used to check a filesystem for usage, and update the quota.user file. |
| chsh | Change the login shell. | repquota | Lists a summary of quota information on filesystems. |
| edquota | Used to edit user or group quotas. This program uses the vi editor to edit the quota.user and quota.group files. | sa | Generates a summary of information about users' processes that are stored in the /var/log/pacct file. |
| faillog | Examine faillog and set login failure limits. | smbclient | Works similar to an ftp client enabling the user to transfer files to and from a windows based computer. |
| finger | See what users are running on a system. | smbmount | Allows a shared directory on a windows machine to be mounted on the Linux machine. |
| gpasswd | Administer the /etc/group file. | smbpasswd | Program to change users passwords for samba. |
| groupadd | Create a new group. | su | Ex: su mark - Effect: changes the user to mark, If not root will need marks password. |
| grpck | Verify the integrity of group files. | sulogin | Single user login. |
| grpconv | Creates /etc/gshadow from the file /etc/group which converts to shadow passwords. | useradd | Create a new user or update default new user information. |
| grpunconv | Uses the files /etc/passwd and /etc/shadow to create /etc/passwd, then deletes /etc/shadow which converts from shadow passwords. | userdel | Delete a user account and related files. |
| groupdel | Delete a group. | usermod | Modify a user account. |
| groupmod | Modify a group. | users | Print the user names of users currently logged in. |
| groups | Print the groups a user is in | utmpdump | Used for debugging. |
| id | Print real and effective user id and group ids. | vigr or vipw | Edit the password or group files. |
| last | Display the last users logged on and how long. | w | Display users logged in and what they are doing. |
| lastb | Shows failed login attempts. This command requires the file /var/log/btmp to exist in order to work. | wall | Send a message to everybody's terminal. |
| lastcomm | Display information about previous commands in reverse order. Works only if process accounting is on. | who | Display the users logged in. |
| lastlog | Formats and prints the contents of the last login. | whoami | Print effective user id. |
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