Posts Tagged ‘Help’

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How to Get Help in Linux


Copyright (c) 2008 Don R. Crawley

Sometimes, especially for Windows and Macintosh administrators, a move to the Linux operating system can seem a bit intimidating, especially because of the more traditional approach to administration through the Command Line Interface (CLI). The good news is that Linux includes ample, built-in help including “man” pages, “info”, “help”, and “apropos”. In this article, I’ll explain your options and give you some practice using each of them. The information in this article should be applicable in any flavor of Linux.

Using “man”

“man” formats and displays the online manual pages. There are manual pages for nearly every command imaginable. Unfortunately, many of the man pages assume a fairly extensive background in UNIX, therefore they often require research beyond the initial man page.

The man pages are divided into sections. Many man entries appear in only one section, but some might appear in multiple sections such as when a command and a library function have the same name. The sections that are most likely to be of interest to system and network administrators are sections 1, 5, and 8.

Section 1: user commands
Section 2: system calls
Section 3: library functions
Section 4: special files
Section 5: file formats
Section 6: games (introduction)
Section 7: conventions and miscellany
Section 8: administration and privileged commands Section L: math library functions
Section N: tcl fuctions (Tool command language, a dynamic programming language)

You can view a man page as follows (the “#” or “$” is part of the prompt): #man chown

The above command will display the man page for the “chown” command.

You can specify a particular section as follows:: #man 1 chmod

The above command would display only section 1 (the user commands section) of the manual for the chmod command. chmod is also a system call, so if you wanted to see the man page for the system call “chmod”, you would need to enter the following command: #man 2 chmod

Using “info”

“info” is an on-line manual reader used by the GNU Project to document utilities. It’s similar to man (and often produces identical documents), but offers a standardized set of commands for viewing the documentation. The info utility does not assume as great a depth of UNIX knowledge as man.

Basic usage is similar to man: #info chown

The above command will display the info page for the chown command.

Info divides its help into nodes instead of sections. A node, like a section in man, describes a specific topic at a specific level of detail. In a moment, I’ll show you where to find a tutorial on using info.

Using “help”

The “help” option is included with most GNU utilities. It displays command options and other information about the utility in question, for example: #ls –help

The above command would show options and other information about the ls command.

Using “apropos”

“apropos” looks in the description sections of man pages for text strings. When executed, apropos will return every man page whose description contains the specified text string: #apropos edit

The above command will display a list of every man page whose description contains the text string “edit”.

apropos is helpful when you know what you want to do, but you’re not certain of the appropriate utility or command to accomplish it.

Practice Getting Help

The following exercises will familiarize you with the various commands available for getting help including man, info, apropos, and –help.

Practice working with man
1. In a terminal window, enter the following command: $man ls
2. Press Enter. Notice that one additional line of text is displayed.
3. Now press the space bar. Notice that an additional page of text is displayed.
4. Use the arrow keys to move up and down through the page. When you’re finished, touch “q” to quit.
5. Enter the following command: $man 1 chmod
What do you see in the upper left-hand corner of the screen?
6. Touch “q” to quit.
7. Enter the following command (“$” is part of the prompt): $man 2 chmod
Notice in both the upper left and right-hand corners of the screen that the section number is displayed.
8. Touch “q” to quit the man page.

Practice working with the apropos utility

1. Start by entering the following command to see the man page for chmod: $man chmod
2. Read the description and notice that it includes the word “permissions”.
3. Now, enter the following command: $apropos permissions
4. Notice in the output that chmod is listed, along with every other command whose description includes the word “permissions”.

Practice Working with info

Next, you’ll use the info utility to view help for commands and learn how to navigate info pages by working through the first part of an “info” tutorial.

1. Enter the following command to see the info page for chmod: $info chmod
The info page for chmod opens.
2. Touch the “h” key to start a brief tutorial for info.
3. Touch the “q” key when you’re finished.

Working with –help

This exercise will show you how to use –help with GNU utilities.

1. Enter the following command: $chmod –help
Notice that the help screen, albeit abbreviated, shows you the proper syntax for using the chmod command.
2. Enter the following command: $ls –help
Notice that the help screen fills more than one screen. Use the key combination of Shift-PageUp and Shift-PageDown to move up and down through the Terminal window.

As you can see from the preceeding exercises, in spite of the somewhat daunting nature of a CLI, Linux provides ample help for your use in mastering the operating system.

Don R. Crawley, Linux+ and CCNA-certified, is president and chief technologist at soundtraining.net, the Seattle training firm specializing in business skills and technical training for IT professionals. He works with IT pros to enhance their work, lives, and careers. For more information about soundtraining.net’s accelerated Cisco and Linux training, visit here.

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Please read and let me know how you would analyze this article:The Water Crisis: Analysis and Proposals

By Celine Tan

Water and sanitation is the first of five priority action areas under the
WEHAB plan for the post-WSSD implementation of sustainable development.
The challenge of providing safe and clean water and sanitary conditions for
an increasing world population, in the face of rising inequities, is
phenomenal.

Forty percent of the world’s population, in 80 countries, currently suffer
from serious water shortages. A billion people worldwide lack access to
safe drinking water and 2.4 billion people lack access to adequate
sanitation (Global Economic Outlook 2002).

Yet, the biggest threat to universal access to clean water and adequate
sanitation is not mother nature but corporate globalisation. Privatisation
of water is aggressively exported to the developing world under the rubric
of poverty reduction and debt relief strategies, free trade and economic
development. By turning a scarce resource into an economic commodity, the
world’s economic leaders and policy planners claim that existing water
resources can be managed and consumed efficiently in accordance with
competitive market principles. These claims are not only misguided, they
are deceitful. There are two myths being projected: first, that placing a
price on water will encourage conservation and wise water consumption.
Secondly, that market competition will lead to more consumer choice and
better services. In reality, the water sector is monopolistic when placed
in the hands of the market. It is thus alarming that the commodification of
water resources is now heralded as the answer to the world’s water woes.

Monopoly and subsidies for corporations

Water is a US$400 billion global business, controlled by a handful of
European transnational companies and consortiums, namely French
multinationals Vivendi and Suez Lyonnaise, SAUR and British water companies
Thames Water, Anglia Water and United Utilities. The global drive towards
privatisation of water services is thus pursued not by a collective of
democratically elected governments acting in the interest of the world’s
population, but by a cartel of corporations motivated by profit and market
conquest.

To make matters worse, these companies are subsidised by their governments
(and invariably their taxpayers) through support from domestic export
credit agencies, and by multilateral development banks, such as the World
Bank and the African Development Bank. They are also subsidised by
developing countries who raise credit from international financial
institutions to upgrade their water systems prior to private takeover. This
corporate subsidy comes at the expense of consumers, most of them in
developing countries, who are made to pay for what is a necessity of life.
For the poor this means no access to water.

Additional loans to facilitate the privatisation process are raised by
developing country governments from multilateral and bilateral sources.
Often, these loans are also used to finance the creation of an ‘enabling
environment’ for foreign water and wastewater investors. This includes the
drafting of local investor protection legislation to guard against
re-nationalisation of the water industry and to provide for hefty
compensation for any attempt to renege (for good reasons) against the
privatisation contracts.

In many cases, corporate access to a developing country’s water system is
paved by a loan or debt relief conditionality requiring the poor or
indebted country to privatise its water and sanitation services. For
example, the IMF insisted that Tanzania privatise its Dar es Salaam Water
and Sewerage Authority (DAWSA) as a condition of its debt relief package
under the Heavily Indebted Poor Countries (HIPC) Initiative.

Fallacy of privatisation

Experience shows that the privatisation of water services cannot ensure
universal delivery of safe water and efficient sanitation. Privatisation
imposes additional financial obligations on governments. They may have to
bail out failed privatisation project, and also shoulder the costly legal
risks of rescinding a privatisation contract with a wealthy transnational,
even if the company’s performance is unsatisfactory. Argentina, Hungary and
Bolivia have found that the legal claims for compensation by private water
companies in Tucuman, Szeged and Cochabamba respectively, have made
terminating contracts prohibitively expensive.

The dominance of foreign water companies and the liberalised investment
climate – mostly facilitated by structural adjustment, and now under trade
agreements including those under the WTO Ð in developing countries will
also ensure that a large portion of profits from water privatisation will
not accrue to the countries themselves but are repatriated abroad instead.

The imposition of full-cost water pricing as a result of privatisation will
only deprive more and more people of access to clean and safe water by
forcing poor communities to seek alternative sources of water for
consumption, such as untreated well water and water from sewage-ridden
urban rivers.

Forced upon rich and poor, consumers and industrial producers, similar
rates for water use will also result in greater income disparity and deeper
social cleavages, leading to higher risks of civil unrest. In 2000, martial
law was declared in the Bolivian city of Cochabamba as a result of
city-wide riots precipitated by high water prices. A private consortium led
by International Water doubled the water prices to city residents. Water
bills went up by 35% and some, twice that. The World Bank supported
full-cost water pricing and prohibited any use of its structural adjustment
loans to subsidise water services for the poor.

Future fears and WSSD outcomes

There is no agreement on the text in the WSSD Draft Plan of Implementation
that commits governments to supporting the UN Millennium Development Goal
of halving, by 2015, the proportion of people unable to reach, or afford,
safe drinking water and access improved sanitation (paragraphs 7 and 7[alt]).

However, the most pressing concerns over universal coverage of water and
sanitation services are not expressed in these bracketed paragraphs.
Rather, they are reflected in the general lack of political will
demonstrated by developed countries to address the systemic issues leading
to a crisis of sustainable development in the south, and the alarming
emphasis placed on public-private partnership funding and implementation of
sustainable development programmes. The relinquishing of responsibility by
developed countries is marked by their reluctance to commit to specific
disbursements of ODA and by repeated references to voluntary partnerships
and initiatives as a means of financing WSSD programmatic outcomes.

In the absence of firm commitments by governments, Type II partnerships on
water and sanitation services will only increase private sector involvement
in this crucial area. The private sector is already identified as a key
implementer of the ‘Water, Sanitation and Hygiene (WASH) for All
Initiative’ involving 28 countries, six UN agencies, the World Bank, and
the Asian and African Development Banks.

Another major threat to universal access to water and sanitation is
liberalisation under the WTO’s rules. Although Member countries have the
right to liberalise at their own pace, and even choose not to open up a
sector under the WTO’s General Agreement on Trade in Services (GATS), there
is tremendous pressure especially on developing countries to liberalise.
Thus in the ongoing negotiations at the WTO, developed countries are
submitting extensive ÒrequestsÓ that seek access to every sector in the
developing world, including water services and sanitation.

If developing countries succumb, privatisation of water services initiated
under World Bank and IMF structural adjustment programmes could become
permanent under the binding rules of the WTO. Once a country is locked into
the GATS regime, the right of its government to regulate liberalized
service sectors will be diminished, paving the way for foreign
transnationals to enter the domestic market. Any attempt to reverse the
situation would be subject to WTO disciplines and penalties.

Any real effort to achieve the Millennium Development Goal must therefore
include commitments to review loan conditionalities that impose
privatisation and countries must not be pressured to offer water services
under GATS liberalisation. Essential services should be exempted from GATS.

Conclusion

Privatisation does not address the deeper economic and ecological issues of
water shortages. Questions of why there are water shortages in countries
not under water stress are not resolved by shifting responsibility of
service provision to private companies. Water management and water
distribution are also key factors in determining water supply and universal
coverage. Until and unless rich countries fulfil their commitment to
provide resources for developing countries to build solid, cost-effective
water delivery systems which support the needs of the world’s population
equitably and ecologically, the water woes of the world will not go away.

At the same time, all governments need to recognise and support the
diversity and replication of community water management systems and
practices. These have proven in many countries to be the most sustainable
approach to rural water management for rural populations. The WSSD process
and the last 10 years of the work of the CSD have called for good and best
practices in sustainable development. However, where water resources are
concerned the trend and emphasis are privatisation which has proven
destructive.

Firm commitments must be made at the WSSD to reverse the trend of corporate
takeover in the water and sanitation sector, rather than to accelerate the
process of privatisation and corporate monopoly. Undermining the sovereign
power of governments to regulate supply of water in their countries and
passing the bucket onto private transnationals to steward the world’s water
resources would probably be a most anti-development and anti-ecological step.

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