Short description of unix tail (#22446)

A short description of unix tail

guide/english/bash/bash-tail/index.md

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+---
+title: Bash tail
+---
+
+## Bash tail
+Tail is a program to display the **tail** end of a text file. If no option is given, tail shows the last 10 lines of a given file.
+
+### Usage
+
+```bash
+tail [options] [file_names]
+```
+
+Most used options:
+
+* `-f`, display the last lines and then monitor the file. If new lines are added to the file, tail updates the display.
+* `-c NUM`, display the last `NUM` bytes of the file.
+* `-n NUM`, display the last `NUM` lines, instead of the last 10
+
+
+### Example
+
+To show the last 10 lines from file **log.txt**
+
+```bash
+tail log.txt
+```
+Show only the last line from file **log.txt**
+```bash
+tail -n1 log.txt
+```
+Show live changes from file **log.txt**
+```bash
+tail -f log.txt
+```
+#### More Information:
+* Wikipedia: https://en.wikipedia.org/wiki/Tail_(Unix)