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Update 06-users.md (markdown, spelling, lowercase) #959

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18 changes: 9 additions & 9 deletions docs/books/admin_guide/06-users.md
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Expand Up @@ -9,11 +9,11 @@ In this chapter you will learn how to manage users.
****
**Objectives**: In this chapter, future Linux administrators will learn how to:

:heavy_check_mark: add, delete or modify a **group**;
:heavy_check_mark: add, delete or modify a **user**;
:heavy_check_mark: Understand the files associated with users and groups and learn how to manage them;
:heavy_check_mark: change the *owner* or the *group owner* of a file;
:heavy_check_mark: *secure* user accounts;
:heavy_check_mark: add, delete or modify a **group**;
:heavy_check_mark: add, delete or modify a **user**;
:heavy_check_mark: understand the files associated with users and groups and learn how to manage them;
:heavy_check_mark: change the *owner* or the *group owner* of a file;
:heavy_check_mark: *secure* user accounts;
:heavy_check_mark: change identity.

:checkered_flag: **users**
Expand Down Expand Up @@ -97,7 +97,7 @@ Group naming rules:
DESCRIPTION
adduser and addgroup add users and groups to the system according to command line options and configuration information
in /etc/adduser.conf. They are friendlier front ends to the low-level tools like useradd, groupadd and usermod programs,
by default choosing Debian policy conformant UID and GID values, creating a home directory with skeletal configuration,
by default, choosing Debian policy conformant UID and GID values, creating a home directory with skeletal configuration,
running a custom script, and other features.
```

Expand Down Expand Up @@ -148,7 +148,7 @@ $ sudo groupdel GroupC
When deleting a group, there are two conditions that can occur:

* If a user has a unique primary group and you issue the `groupdel` command on that group, you will be prompted that there is a specific user under the group and it cannot be deleted.
* If a user belongs to a supplementary group (not the primary group for the user) and that group is not the primary group for antoher user on the system, then the `groupdel` command will delete the group without any additional prompts.
* If a user belongs to a supplementary group (not the primary group for the user) and that group is not the primary group for another user on the system, then the `groupdel` command will delete the group without any additional prompts.

Examples:

Expand Down Expand Up @@ -489,7 +489,7 @@ root:$6$...:15399:0:99999:7:::
* 1: Login name.
* 2: Encrypted password. Uses the SHA512 encryption algorithm, defined by the `ENCRYPT_METHOD` of `/etc/login.defs`.
* 3: The time when the password was last changed, the timestamp format, in days. The so-called timestamp is based on January 1, 1970 as the standard time. Every time one day goes by, the timestamp is +1.
* 4: Minimum lifetime of the password. That is, The time interval between two password changes (related to the third field), in days. Defined by the `PASS_MIN_DAYS` of `/etc/login.defs`, the default is 0, that is, when you change the password for the second time, there is no restriction. However, if it is 5, it means that it is not allowed to change the password within 5 days, and only after 5 days.
* 4: Minimum lifetime of the password. That is, the time interval between two password changes (related to the third field), in days. Defined by the `PASS_MIN_DAYS` of `/etc/login.defs`, the default is 0, that is, when you change the password for the second time, there is no restriction. However, if it is 5, it means that it is not allowed to change the password within 5 days, and only after 5 days.
* 5: Maximum lifetime of the password. That is, the validity period of the password (related to the third field). Defined by the `PASS_MAX_DAYS` of `/etc/login.defs`.
* 6: The number of warning days before the password expires (related to the fifth field). The default is 7 days, defined by the `PASS_WARN_AGE` of `/etc/login.defs`.
* 7: Number of days of grace after password expiration (related to the fifth field).
Expand Down Expand Up @@ -653,7 +653,7 @@ uid=1000(alain) gid=1000(GroupA) groupes=1000(GroupA),1016(GroupP)

### `newgrp` command

The `newgrp` command can select a group from the user's supplementary groups as the user's new **temporary** primary group. The `newgrp` command every time you switch a user's primary group, there will be a new **child shell**（child process）. Be careful! **child shell** and **sub shell** are different.
The `newgrp` command can select a group from the user's supplementary groups as the user's new **temporary** primary group. The `newgrp` command every time you switch a user's primary group, there will be a new **child shell**（child process). Be careful! **child shell** and **sub shell** are different.

```
newgrp [secondarygroups]
Expand Down