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This lesson covers various aspects of managing users at the command line in Linux.

When you are working with a large spreadsheet in Microsoft Excel, it's easy to find yourself scrolling down or across and losing track of where you are. This lesson explains how to freeze rows and columns (officially known as "Freeze Panes") in Excel 2010 for Windows and Excel 2011 for Mac.

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This lesson explains how to use Excel's logical operators and logical functions (AND, OR, NOT). These boolean operators can be used in a number of ways, either on their own, or to complement other Excel functions. In many cases, you can even use one of these functions instead of a more complicated function. For example, it is often easy to rewrite an IF statement using either AND or OR. This lesson includes examples of how to do this.

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When writing a formula that references other cells, it can sometimes be useful to check that those cells contain a valid value. In this lesson, we'll look at Excel's ISNUMBER function as a way of doing this.

If you have a column of numbers and you want to calculate a running total of the numbers alongside, you can use the SUM() formula combined with a clever use of absolute and relative references.

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When printing in Excel 2010 for Windows, it is sometimes useful to print a set of rows (e.g. column headings) on each page in the print out. There is nothing worse than having a printout that runs to multiple pages, with the column headings only printed on the first page. This lesson shows you how to get header rows printing at the top of every page.

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 If you're getting started with Excel, creating formulas is one of the first things you should learn. In this lesson you'll learn how to create simple formulas and calculations in Excel.

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The COUNTIFS function in Excel counts the number of cells in a range that match a set of multiple criteria. COUNTIFS extends the COUNTIF function which only allows one criteria. It is similar to SUMIFS, which will find the sum of all cells that match a set of multiple criteria. This lesson shows you how to use COUNTIFS and provides some practical examples to help you understand how it works.

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If you boost a post in Facebook, it's easy to add extra budget to the boosted post, but there is no obvious way to reduce the budget on that post. This lesson provides a quick and simple solution.

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If you want to combine text with the results of a formula in a cell, you can use concatenation. Suppose you have calculated the total of a range of cells using a formula in cell D2. Now, you want to have cell A2 display the text "Today's sales are $12,000", where $12,000 is the value calculated in D2. As the value in D2 changes, you want the value in A2 to update automatically.

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