Displaying all help for commands beginning with a specific character

Shell> help a*

Downloads the Active Health System (AHS).

AHSDOWNLOAD [-n <file name> | -u <serial number>]
[-s <start date> -e <end date>]
[-case <case number>] [-name ,contact name>]
[-phone <phone number>] [-email email address>]
[-company <company name>] [-a] [-l] [-q]

-n               –Overrides the default AHS file name.
-u               –Overrides the serial number field in the default AHS 
                  file name.
-s               –Specifies a start date.
-e               –Specifies an end date.
-a               –Downloads all data from the AHS log.
-l               –Displays AHS available download date range information.
-q               –Performs the download in quiet mode without user prompts.
-case            –Specifies a support case number.
-name            –Specifies a customer name.
-phone           –Specifies a customer phone number.
-email           –Specifies a customer email address.
-company         –Specifies a customer company name.
-file name       –Specifies a destination file name.
-serial number   –Specifies a system serial number.
-start date      –Specifies the start date (in YYYY-MM-DD format) on 
                  which the data from the AHS log is to be retrieved.
-end date        –Specifies the last date (in YYYY-MM-DD format) on 
                  which the data from the AHS log is to be retrieved.
-case number     –Adds a support case number to the customer information 
                  file.
-contact name    –Adds a customer name to the customer information file.
-phone number    –Adds a customer phone number to the customer information 
                  file.
-email address   –Adds a customer email address to the customer 
                  information file.
-company name    –Adds a customer company name to the customer information 
                  file.

NOTES:
  1. The Active Health System monitors and records changes in the server
     hardware and system configuration. The Active Health System assists in
     diagnosing problems and delivering rapid resolution when system 
     failures occur.
  2. The Active Health System does not collect information about your
     operations, finances, customer, employees, partners, or data center
     (for example, IP addresses, host names, user names, and passwords
     are not collected). By downloading and sending the Active Health 
     System data, you agree to have support personnel use the data 
     for analysis, technical resolution, and quality improvements.
  3. This command mounts an AHS partition and downloads AHS log files
     and bundles into an .ahs package file.
  4. If the start date (-s) and end date (-e) are not specified, by 
     default AHS data related to the last 7 days is downloaded.
  5. If a start date (-s) without an end date (-e) is specified, AHS
     uses the current date as and end date to download.
  6. If a start date (-s) and  end date (-e) are specified, only AHS data 
     in that date range, including start and end dates, is downloaded.
  7. If a file name is not specified using the —n option, a default file 
     name is generated. For instance, AHS_xxxxxxxxxxx_20140821.ahs.
  8. This command does not support downloading an Active Health file (.ahs)
     to the internal SD card.

EXAMPLES:
  * To display available AHS download date range information:
    fs0:\> ahsdownload —1

  * To download an AHS file to the default location with a log spanning 7 
    days (the default range):
    fs0:\> ahsdownload 

  * To download an AHS file to the default location with a complete log 
    available:
    fs0:\> ahsdownload —a

  * To download an AHS file with a specific date range:
    fs0:\> ahsdownload —n ahstestfile.ahs —s 2014–04–02 —e 2014–04–07

  * To download an AHS file to the default location with a complete log 
    and customer information:
    fs0:\> ahsdownload —a —case 1234 —name Joe —phone 123–456–7890
    –email ahstest@testing.com —company MyCompany

Displays, creates, or deletes UEFI Shell aliases.

ALIAS [-d|-v] [alias-name] [command-name]m all files with extension '.inf':
    fs0:\> attrib -r *.inf
  -d           - Delete an alias. command-name must not be specified.
  -v           - Make the alias volatile.
  alias-name   - Alias name
  command-name - Original command's name or path.

NOTES:
  1. This command displays, creates, or deletes aliases in the UEFI Shell
     environment.
  2. An alias provides a new name for an existing UEFI Shell
     command or UEFI application. Once the alias is created, it can be used
     to run the command or launch the UEFI application.
  3. There are some aliases that are predefined in the UEFI Shell 
     environment. These aliases provide the MS-DOS and UNIX 
     equivalent names for the file manipulation commands.
  4. Aliases will be retained even after exiting the shell unless the -v 
     option is specified. If -v is specified the alias will not be valid 
     after leaving the shell.

EXAMPLES:
  * To display all aliases in the UEFI Shell environment:
    Shell> alias

  * To create an alias in the UEFI Shell environment:
    Shell> alias shutdown "reset -s"

  * To delete an alias in the UEFI Shell environment:
    Shell> alias -d shutdown

  * To add a volatile alias in the current UEFI environment, which has a 
    star * at the line head. This volatile alias will disappear at next 
    boot.
    Shell> alias -v fs0 floppy


Displays or changes the attributes of files or directories.

ATTRIB [+a|-a] [+s|-s] [+h|-h] [+r|-r] [file...] [directory...]

  +a|-a     - Set or clear the 'archive' attribute
  +s|-s     - Set or clear the 'system' attribute
  +h|-h     - Set or clear the 'hidden' attribute
  +r|-r     - Set or clear the 'read-only' attribute
  file      - File name (wildcards are permitted)
  directory - Directory name (wildcards are permitted)

NOTES:
  1. Four attribute types are supported in the UEFI file system:
     - Archive [A]
     - System [S]
     - Hidden [H]
     - Read only [R]
  2. If a file (in general meaning) is a directory, it is also shown
     to have the attribute [D].
  3. If any file in the file list that is specified in the command line
     does not exist, attrib will continue processing the remaining files
     while reporting the error.
  4. If no attributes parameters are specified, the current attributes of
     the specified files or directories will be displayed.
  5. If no files or directories are specified, the command applies to
     all files and sub-directories within the current directory.

EXAMPLES:
  * To display the attributes of a directory:
Shell> :\> attrib fs0:\

  * To display the attributes of all files and sub-directories in the 
    current directory:
    fs0:\> attrib *

  * To add the system attribute to all files with extension '.efi':
    fs0:\> attrib +s *.efi

  * To remove the read only attribute from all files with extension '.inf':
    fs0:\> attrib -r *.inf