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    <p>According to <a href="https://stackoverflow.com/questions/7428997/whats-gem-can-operate-excel-on-linux">this post</a>, the <a href="https://rubygems.org/gems/spreadsheet" rel="nofollow noreferrer">spreadsheet</a> gem is a possibility. It looks like this is a very popular gem. Check it out. Example: </p> <pre><code>book = Spreadsheet::Workbook.new sheet1 = book.create_worksheet header_format = Spreadsheet::Format.new( :weight =&gt; :bold, :horizontal_align =&gt; :center, :bottom =&gt; true, :locked =&gt; true ) sheet1.row(0).default_format = header_format FasterCSV.open(input_path, 'r') do |csv| csv.each_with_index do |row, i| sheet1.row(i).replace(row) end end book.write(output_path) </code></pre> <p>According to <a href="https://stackoverflow.com/questions/9886361/use-different-color-for-different-values-in-drop-down-for-excel-files-created">this post</a>, <a href="http://rubygems.org/gems/write_xlsx" rel="nofollow noreferrer">write_xlsx</a> is a possibility.</p> <p>I've used the <a href="http://poi.apache.org/spreadsheet/index.html" rel="nofollow noreferrer">Apache POI library</a> with JRuby to export xls files. Here's a quick example.</p> <pre><code>require 'java' require 'poi.jar' # require 'poi-ooxml.jar' require 'rubygems' require 'fastercsv' java_import org.apache.poi.hssf.usermodel.HSSFWorkbook; wb = HSSFWorkbook.new # OR XSSFWorkbook, for xlsx sheet = wb.create_sheet('Sheet 1') FasterCSV.open(ARGV.first) do |csv| csv.each_with_index do |csv_row, line_no| row = sheet.createRow(line_no) csv_row.each_with_index do |csv_value, col_no| cell = row.createCell(col_no) cell.setCellValue(csv_value) unless csv_value.nil? # can't pass nil. end end end f = java.io.FileOutputStream.new("workbook.xls") wb.write(f) f.close </code></pre> <p>Some useful methods for formatting POI spreadsheets are </p> <ul> <li><code>sheet.createFreezePane(0,1,0,1)</code> </li> <li><code>wb.setRepeatingRowsAndColumns(0, -1, -1, 0, 1)</code></li> <li><code>sheet.setColumnWidth(i, 100 *256)</code></li> <li><code>sheet.autoSizeColumn(i)</code>, but beware, if you're running in headless mode, you have to call <code>java.lang.System.setProperty("java.awt.headless", "true")</code></li> </ul> <p>You can also use Win32ole on Windows, if you have Excel installed</p> <pre><code>require 'win32ole' require 'rubygems' require 'fastercsv' xl = WIN32OLE.new('Excel.Application') xl.Visible = 0 wb = xl.Workbooks.Add ws = wb.Worksheets(1) FasterCSV.open(ARGV.first) do |csv| csv.each_with_index do |csv_row, line_no| csv_row.each_with_index do |value, col| ws.Cells(line_no + 1, col + 1).Value = value end end end wb.SaveAs("workbook.xls", 56) # 56 = xlExcel8 aka Excel 97-2003. i.e. xls wb.SaveAs("workbook.xlsx", 51) # 51 = xlOpenXMLWorkbook wb.SaveAs("workbook.xlsb", 50) # 50 = xlExcel12 wb.Close(2) #xlDoNotSaveChanges xl.Quit </code></pre> <p>Some useful methods for formatting with Excel are</p> <ul> <li><code>xl.Rows(1).Font.Bold = true</code></li> <li><code>ws.Cells.EntireColumn.AutoFit</code></li> </ul> <p>Yet another option is to write directly to Microsoft's <a href="http://msdn.microsoft.com/en-us/library/aa140066%28v=office.10%29" rel="nofollow noreferrer">XML Spreadsheet</a> format, as Ryan Bates at Railscasts.com does <a href="http://railscasts.com/episodes/362-exporting-csv-and-excel" rel="nofollow noreferrer">at the end of his <em>Exporting CSV and Excel</em> episode</a>.</p> <pre class="lang-xml prettyprint-override"><code>&lt;?xml version="1.0"?&gt; &lt;Workbook xmlns="urn:schemas-microsoft-com:office:spreadsheet" xmlns:o="urn:schemas-microsoft-com:office:office" xmlns:x="urn:schemas-microsoft-com:office:excel" xmlns:ss="urn:schemas-microsoft-com:office:spreadsheet" xmlns:html="http://www.w3.org/TR/REC-html40"&gt; &lt;Worksheet ss:Name="Sheet1"&gt; &lt;Table&gt; &lt;Row&gt; &lt;Cell&gt;&lt;Data ss:Type="String"&gt;ID&lt;/Data&gt;&lt;/Cell&gt; &lt;Cell&gt;&lt;Data ss:Type="String"&gt;Name&lt;/Data&gt;&lt;/Cell&gt; &lt;Cell&gt;&lt;Data ss:Type="String"&gt;Release Date&lt;/Data&gt;&lt;/Cell&gt; &lt;Cell&gt;&lt;Data ss:Type="String"&gt;Price&lt;/Data&gt;&lt;/Cell&gt; &lt;/Row&gt; &lt;% @products.each do |product| %&gt; &lt;Row&gt; &lt;Cell&gt;&lt;Data ss:Type="Number"&gt;&lt;%= product.id %&gt;&lt;/Data&gt;&lt;/Cell&gt; &lt;Cell&gt;&lt;Data ss:Type="String"&gt;&lt;%= product.name %&gt;&lt;/Data&gt;&lt;/Cell&gt; &lt;Cell&gt;&lt;Data ss:Type="String"&gt;&lt;%= product.released_on %&gt;&lt;/Data&gt;&lt;/Cell&gt; &lt;Cell&gt;&lt;Data ss:Type="Number"&gt;&lt;%= product.price %&gt;&lt;/Data&gt;&lt;/Cell&gt; &lt;/Row&gt; &lt;% end %&gt; &lt;/Table&gt; &lt;/Worksheet&gt; &lt;/Workbook&gt; </code></pre> <p><a href="https://github.com/randym/axlsx" rel="nofollow noreferrer">This gem looks promising, too</a>.</p>
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    1. POHow to convert CSV to Excel?
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    1. COIt seems like if you are using win32ole anyway you could just 'open' the csv file in excel and save it as xls. I'm not sure what the code would be though.
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    2. COGood point. I hoped to just make the example look similar to the one above it, but opening the CSV directly into Excel is a smarter idea.
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    3. COThere is one more gem i found writeexcel did the job very easily.. Thanks again.
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