Intro to Linux | Cisco Lab16 | Creating Users and Groups
00:00 -16.1: Intruction
Will be using: groupadd, groupmod, useradd, passwd, usermod, command.
00:43 -16.2: Creating Groups
*Basic information.
Need to be in root to do these changes, use su command.
Use the groupadd command to make new groups.
NOTE: -r command to overwrite into reserved range.
Use the groupmod command to change parts of the group.
Use the -n to change the name and -g to change the GID. Use group del to delete either of the groups.
03:25 -16.2.3: getent and grep command
Use the getent command to get information about a group. Syntax: getent group [group name].
Use the grep command to search information inside of a group. Syntax: grep [group name] [directory].
04:29 -16.2.5: groupmod command
Make modifications to a group. General Syntax: groupmod [option] [...] [...].
Use the -n option to change the name. Syntax: groupmod [-n] [new name] [old name].
Use the -g option to change the GID. Syntax: groupmod [-g] [new ID number] [group name].
Use the grep command to verify the information has been changed.
Use the groupdel command to delete a group. Syntax: groupdel [group name].
NOTE: If we change the GID or delete a group all files owned by that group will be orphaned.
06:54 -16.3: User Configuration
Use the useradd -D to display new user settings.
Use the -k to change a skeleton directory.
Use the -f and a number to change the inactive parameter. This is the amount of days after a user's password expires that they can still log in. Syntax: useradd -D -f [number of days].
Use nano to modify the CREATE_MAIL_SPOOL.
10:15 -16.3.6 Adding a user to a group with comments and their own home directory.
Creating a new student. Syntax: useradd -G [group name] -c ' [comments] ' -m [username].
Using grep to check directories and ensure we did this correctly.
11:50 -16.3.7: Using usermod command
Adding a user to a group. Syntax: usermod -aG [group] [user's username].
Use the getent command to get information about a group. Syntax: getent group [group name].
13:20 -16.3.9: Setting a user's password
Syntax: passwd [user's username].
14:16 -16.3.10: To see when a user last logged in and locking accounts
Syntax: last. This lists all the last logins.
Syntax: last [username]. Lists the last login of this specified user.
Use the lastb command to see all bad/ failed logins.
Use the usermod -L command to lock a user's account. Syntax: usermod -L [user's username].
Use the usermod -U command to unlock a user's account. Syntax: usermod -U [user's username].
15:10 -16.3.11: Deleting a user's account
Basic Syntax: userdel [user's username].
To delete the user and their home directory and mail use: Syntax: userdel -r [user's username].
NOTES: https://docs.google.com/document/d/1G...
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