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Mar 18, 2022
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Minor modifications to options #627

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Minor modifications to options
jimcat8 Mar 18, 2022
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Description of the id command
jimcat8 Mar 18, 2022
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runlevel
jimcat8 Mar 18, 2022
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41 changes: 21 additions & 20 deletions docs/books/admin_guide/03-commands.md
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Expand Up @@ -334,24 +334,25 @@ In this last example, the `-d` option displays a given date. The `+%j` option fo

The date display can follow the following formats:

| Option | Format |
| --------| -------------------------------- |
| `+%A` | Full Name of Day |
| `+%B` | Full Name of Month |
| `+%c` | Full Date Display |
| `+%d` | Day number |
| `+%F` | Date in `YYYY-MM-DD` format |
| `+%G` | Year |
| `+%H` | Time of day |
| `+%j` | Day of the year |
| `+%m` | Month number |
| `+%M` | Minute |
| `+%R` | Time in `hh:mm` format |
| `+%s` | Seconds since January 1, 1970 |
| `+%T` | Time in `hh:mm:ss` format |
| `+%u` | Day of the week (`1` for Monday) |
| `+%V` | Week number (`+%V`) |
| `+%x` | Date in format `DD/MM/YYYY` |
| Option | Format |
| --------| --------------------------------------------------------- |
| `+%A` | Locale's full weekday name (e.g., Sunday) |
| `+%B` | Locale's full month name (e.g., January) |
| `+%c` | Locale's date and time (e.g., Thu Mar 3 23:05:25 2005) |
| `+%d` | Day of month (e.g., 01) |
| `+%F` | Date in `YYYY-MM-DD` format |
| `+%G` | Year |
| `+%H` | Hour (00..23) |
| `+%j` | Day of the year (001..366) |
| `+%m` | Month number (01..12) |
| `+%M` | Minute (00..59) |
| `+%R` | Time in `hh:mm` format |
| `+%s` | Seconds since January 1, 1970 |
| `+%S` | Second (00..60) |
| `+%T` | Time in `hh:mm:ss` format |
| `+%u` | Day of the week (`1` for Monday) |
| `+%V` | Week number (`+%V`) |
| `+%x` | Date in format `DD/MM/YYYY` |

The `date` command also allows you to change the system date and time. In this case, the `-s` option will be used.

Expand All @@ -367,7 +368,7 @@ date -s "[AA]AA-MM-JJ hh:mm:[ss]"

### `id`, `who` and `whoami` commands

The `id` command displays the name of the current user and its groups or those of a user, if the user's login is given as an argument.
The `id` command is used to display information about users and groups. By default, no user parameter is added, and the information of the currently logged in user and group is displayed。

```bash
$ id rockstar
Expand All @@ -391,7 +392,7 @@ Since Linux is multi-user, it is likely that multiple sessions are open on the s
* tty: represents a terminal.
* pts/: represents a virtual console in a graphical environment with the number after representing the instance of the virtual console (0, 1, 2...)

The `-r` option also displays the execution level (see chapter "startup").
The `-r` option also displays the runlevel (see chapter "startup").

## File tree

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