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1,2,3,4,5,6,7,8,9,10,11
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Слайды и текст к этой презентации:
№1 слайд![Users Groups Folders Files](/documents_6/0f7d54e184d34d808e3e287914bff111/img0.jpg)
Содержание слайда: Users \ Groups
Folders \ Files permissions
№2 слайд![User](/documents_6/0f7d54e184d34d808e3e287914bff111/img1.jpg)
№3 слайд![etc passwd file username](/documents_6/0f7d54e184d34d808e3e287914bff111/img2.jpg)
Содержание слайда: /etc/passwd file
username:password:UID:GID:GECOS:/home/dir:shell
root:x:0:0:root:/root:/bin/bash
№4 слайд![etc shadow file root EA l lWI](/documents_6/0f7d54e184d34d808e3e287914bff111/img3.jpg)
Содержание слайда: /etc/shadow file
root:$6$EA9l7lWI$1KXpR1dYwKe0icL0ohivqdyPdwzcxn0FuH.:16856:0:99999:7:::
Username, up to 8 characters. Case-sensitive, usually all lowercase. A direct match to the username in the /etc/passwd file.
Password, encrypted.
The number of days since January 1, 1970 since the password was last changed.
The number of days before password may be changed (0 indicates it may be changed at any time)
The number of days after which password must be changed (99999 indicates user can keep his or her password unchanged for many, many years)
The number of days to warn user of an expiring password (7 for a full week)
The number of days after password expires, but can be used. Account will be disabled if pwd is not changed.
The number of days since January 1, 1970 when an account will be disabled
A reserved field for possible future use
№5 слайд![Groups etc group file](/documents_6/0f7d54e184d34d808e3e287914bff111/img4.jpg)
Содержание слайда: Groups
/etc/group file
groupname:password:GID:list of users
root:x:0:
№6 слайд![Root user root is the user](/documents_6/0f7d54e184d34d808e3e287914bff111/img5.jpg)
Содержание слайда: Root user
root is the user name or account that by default has access to all commands and files on a Linux or other Unix-like operating system. It is also referred to as the root account, root user and the superuser.
Gain root access: su –
№7 слайд![Sudo Example sudo some](/documents_6/0f7d54e184d34d808e3e287914bff111/img6.jpg)
Содержание слайда: Sudo
Example: sudo some command
Note: all commands executed using sudo are logged by default to /var/log/secure
/etc/sudoers file
№8 слайд![Managing users useradd](/documents_6/0f7d54e184d34d808e3e287914bff111/img7.jpg)
Содержание слайда: Managing users
useradd username - creates user
usermod – modifies user (see help)
userdel username – deletes user (with ‘-r’ deletes it’s home directory)
passwd username – sets password
№9 слайд![UID ranges UID is always](/documents_6/0f7d54e184d34d808e3e287914bff111/img8.jpg)
Содержание слайда: UID ranges
UID 0 is always assigned to the superuser account, root.
UID 1 – 200 is a range of ‘system users’ assigned statically to system.
UID 200 - 999 is a range of ‘system users’ used by system processes that do not own files on the file system. They are typically assigned dynamically from the available pool when the software that needs them is installed. Programs run as these ‘unprivileged’ system users in order to limit their access to just the resources they need to function.
UID 1000+ is the range available for assignment
№10 слайд![Managing groups groupadd](/documents_6/0f7d54e184d34d808e3e287914bff111/img9.jpg)
Содержание слайда: Managing groups
groupadd groupname - creates group (-g GID)
groupmod – modifies group (see help)
groupdel groupname - deletes group
№11 слайд![Managing file system](/documents_6/0f7d54e184d34d808e3e287914bff111/img10.jpg)
Содержание слайда: Managing file system permissions
chmod WhoWhatWhich file / directory
Who is u, g, o, a (user, group, other, all)
What is +, -, = (add, remove, set exactly)
Which is r, w, x (read = 4, write = 2, executable = 1)
chown username:groupname file / folder(-R recursive)