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Apr 27, 2022
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Supplementary explanation of option and error modification of content #679

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Supplementary explanation of option and error modification of content
jimcat8 Apr 27, 2022
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jimcat8 Apr 27, 2022
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19 changes: 10 additions & 9 deletions docs/books/admin_guide/03-commands.md
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Expand Up @@ -981,25 +981,25 @@ The `sort` command sorts the lines of a file.
It allows you to order the result of a command or the content of a file in a given order, numerically, alphabetically, by size (KB, MB, GB) or in reverse order.

```bash
sort [-kx] [-n] [-u] [-o file] [-ty] file
sort [-k] [-n] [-u] [-o file] [-t] file
```

Example:

```bash
$ sort -k3 -t: -n /etc/passwd
$ sort -k 3,4 -t ":" -n /etc/passwd
root:x:0:0:root:/root:/bin/bash
adm:x:3:4:adm:/var/adm/:/sbin/nologin
```

| Option | Observation |
| --------- | ------------------------------------------- |
| `-kx` | Specifies the `x` column to sort on |
| `-k` | Specify the columns to be separated. You can specify multiple columns |
| `-n` | Requests a numeric sort |
| `-o file` | Saves the sort to the specified file |
| `-ty` | Specifies the field separator character `y` |
| `-r` | Reverse the order of the result |
| `- u` | Only keeps unique results |
| `-t` | Specify a delimiter, which requires that the contents of the corresponding file must be regularly delimited column contents, otherwise they cannot be sorted properly |
| `-r` | Reverse the order of the result. Used in conjunction with the `-n` option to sort in order from largest to smallest |
| `-u` | Remove duplicates after sorting. Equivalent to `sort file | uniq` |

The `sort` command sorts the file only on the screen. The file is not modified by the sorting. To save the sort, use the `-o` option or an output redirection `>`.

Expand All @@ -1008,9 +1008,10 @@ By default, the numbers are sorted according to their character. Thus, "110" wil
The `sort` command reverses the order of the results, with the `-r` option:

```bash
$ sort -k3 -t: -n -r /etc/passwd
root:x:0:0:root:/root:/bin/bash
adm:x:3:4:adm:/var/adm/:/sbin/nologin
$ sort -k 3 -t ":" -n -r /etc/passwd
nobody:x:65534:65534:Kernel Overflow User:/:/sbin/nologin
systemd-coredump:x:999:997:systemd Core Dumper:/:/sbin/nologin
polkitd:x:998:996:User for polkitd:/:/sbin/nologin
```

In this example, the `sort` command will sort the contents of the `/etc/passwd` file this time from largest uid to smallest.
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