Command help on linx

Dear all,
I am relatively new for linux. I am exciting about the perfomance of linux.
Please can enyone explain how to resolve command help.
eg how can i identify the arguments of commands
what meaning by [] <> [ <> <> ]
# ifconfig --help
Usage:
ifconfig [-a] [-i] [-v] [-s] <interface> [[<AF>] <address>]
[add <address>[/<prefixlen>]]
[del <address>[/<prefixlen>]]
[[-]broadcast [<address>]] [[-]pointopoint [<address>]]
[netmask <address>] [dstaddr <address>] [tunnel <address>]
[outfill <NN>] [keepalive <NN>]
[hw <HW> <address>] [metric <NN>] [mtu <NN>]
[[-]trailers] [[-]arp] [[-]allmulti]
[multicast] [[-]promisc]
[mem_start <NN>] [io_addr <NN>] [irq <NN>] [media <type>]
[txqueuelen <NN>]
[[-]dynamic]
up ...
if i coud undestand it i can resolve the others.
Please help.
Message was edited by:
Upul Indika

If you have hard time understand the simplified help message, you can always google the whole term on internet, there's plenty of resources.
Also, man is a lot more descriptive in most cases,
for example,
man ifconfig
ifconfig(1M)                                                   ifconfig(1M)
NAME
      ifconfig - configure network interface parameters
SYNOPSIS
      ifconfig [-m mod1[,mod2]...] interface [address_family]
           [address[dest_address]] [parameters]
      ifconfig interface [address_family]
DESCRIPTION
      The first form of the ifconfig command assigns an address to a network
      interface and/or configures network interface parameters. ifconfig
      must be used at boot time to define the network address of each
      interface present on a machine. It can also be used at other times to
      redefine an interface's address or other operating parameters. If the
      address_family is not specified, the address family defaults to IPv4.
      The second form of the command, without address_family, displays the
      current configuration for interface. If address_family is not
      specified, ifconfig reports the details on all supported address
      families. An exception is when the user has not configured any
      interface with an IPv6 address, ifconfig does not display the IPv6
      loopback interface.
      Only a user with appropriate privileges can modify the configuration
      of a network interface. All users can run the second form of the
      command.
    Arguments
      ifconfig recognizes the following arguments:
           -m mod1[,mod2]...
                          A list of modules that can be pushed on a stream
                          associated with an interface. The -m option can
                          be used to configure an interface manually with
                          the specified module names. There is no space
                          between the module names and only a comma is used
                          to separate the module names. If the -m option is
                          specified, ifconfig pushes all modules on the
                          stream associated with the interface in the
                          specified order. For example, module mod2 is
                          pushed on top of module mod1. The modules are
                          pushed between IP and network drivers. If the -m
                          option is not specified, the modules (if any)
                          specified in the DEFAULT_INTERFACE_MODULES
                          variable are used for configuring the interface
                          (see netconf and netconf-ipv6 in
                          /etc/rc.config.d/).
           address        Either a host name present in the host name
                          database (see hosts(4)), or a DARPA Internet
Hewlett-Packard Company            - 1 -      HP-UX 11i Version 2: Mar 2005
ifconfig(1M)                                                   ifconfig(1M)
                          address expressed in Internet standard dot
                          notation (see inet(3N)) for an IPv4 address and in
                          colon notation (see inet6(3N)) for an IPv6
                          address.
           address_family Name of protocol on which naming scheme is based.
                          An interface can receive transmissions in
                          differing protocols, each of which may require
                          separate naming schemes. The address_family,
blah.........blah.....

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