Updated "uname" and "mkdir" commands. (bobbyiliev#266)

* Improved readability and corrected spelling.

* Minor cleanup of the "head" command.

* Updates to the "head", "tail", and "pwd" commands.

* Updated the "touch" and "cal" commands.

* Updates to the "df" command.

* Updates to the "help" and "factor" commands.

* Update 006-the-pwd-command.md

* Updating "uname" and "mkdir" commands.

Co-authored-by: Bobby Iliev <[email protected]>

Author: kcclemo

ebook/en/content/013-the-uname-command.md

@@ -1,37 +1,31 @@
 # The `uname` command
-
 The `uname` command lets you print out system information and defaults to outputting the kernel name.
 
-### Examples
-
-1. Print out all system information
-
+## Syntax:
+```bash
+$ uname [OPTION]
 ```
-uname -a
-```
-
-2. Print out the kernel version
 
+## Examples
+1. Print out all system information.
+```bash
+$ uname -a
 ```
-uname -v
-```
-
-### Syntax:
 
+2. Print out the kernel version.
+```bash
+$ uname -v
 ```
-uname [OPTION]
-```
-
-### Additional Flags and their Functionalities
 
-|**Short Flag**   |**Long Flag**   |**Description**   |
-|:---|:---|:---|
-|`-a`|`--all`|print all information, except omit processor and hardware platform if unknown|
-|`-s`|`--kernel-name`|print the kernel name|
-|`-n`|`--nodename`|print the network node hostname|
-|`-r`|`--kernel-release`|print the kernel release|
-|`-v`|`--kernel-version`|print the kernel version|
-|`-m`|`--machine`|print the machine hardware name|
-|`-p`|`--processor`|print the processor type (non-portable)|
-|`-i`|`--hardware-platform`|print the hardware platform (non-portable)|
-|`-o`|`--operating-system`|print the operating system|
+## Options
+|**Short Flag**|**Long Flag**|**Description**|
+|:-|:-|:-|
+|`-a`|`--all`|Print all information, except omit processor and hardware platform if unknown.|
+|`-s`|`--kernel-name`|Print the kernel name.|
+|`-n`|`--nodename`|Print the network node hostname.|
+|`-r`|`--kernel-release`|Print the kernel release.|
+|`-v`|`--kernel-version`|Print the kernel version.|
+|`-m`|`--machine`|Print the machine hardware name.|
+|`-p`|`--processor`|Print the processor type (non-portable).|
+|`-i`|`--hardware-platform`|Print the hardware platform (non-portable).|
+|`-o`|`--operating-system`|Print the operating system.|

ebook/en/content/014-the-mkdir-command.md

@@ -1,26 +1,44 @@
 # The `mkdir` command
-
 The `mkdir` command in Linux/Unix is used to create a directory.
 
-For example: 
 
-```
-mkdir name_of_directory
+## Syntax
+```bash
+$ mkdir [-m=mode] [-p] [-v] [-Z=context] directory [directory ...]
 ```
 
-If you want to create a subdirectory within a directory you can use the path to that directory.
-
-For example:
+## Examples
+1. Make a directory named **myfiles**.
+```bash
+$ mkdir myfiles
+```
 
+2. Create a directory named **myfiles** at the home directory:
+```bash
+$ mkdir ~/myfiles
 ```
-mkdir /home/test
+
+3. Create the **mydir** directory, and set its file mode (`-m`) so that all users (`a`) may read (`r`), write (`w`), and execute (`x`) it.
+```bash
+$ mkdir -m a=rwx mydir
 ```
 
 You can also create sub-directories of a directory. It will create the parent directory first, if it doesn't exist. 
 If it already exists, then it move further to create the sub-directories without any error message.
 
-For example:
+For directories, this means that any user on the system may view ("read"), and create/modify/delete ("write") files in the directory. Any user may also change to ("execute") the directory, for example with the `cd` command.
 
+4. Create the directory **/home/test/src/python**. If any of the parent directories **/home**, **/home/test**, or **/home/test/src** do not already exist, they are automatically created.
+```bash
+$ mkdir -p /home/test/src/python
 ```
-mkdir -p /home/test/src/python
-```
+
+## Options
+|**Short Flags**|**Long Flags**|**Descriptions**|
+|:-|:-|:-|
+|`-m`|`--mode=MODE`|Set file mode (as in chmod), not `a=rwx - umask`.|
+|`-p`|`--parents`|No error if existing, make parent directories as needed.|
+|`-v`|`--verbose`|Print a message for each created directory.|
+|`-Z`|`--context=CTX`|Set the SELinux security context of each created directory to CTX.|
+|<center>-</center>|`--help`|Display a help message and exit.|
+|<center>-</center>|`--version`|Output version information and exit.|