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‎FSTP2/awk/index.html

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<!DOCTYPE html>
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<html lang="en">
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<head>
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<meta charset="UTF-8">
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<meta name="viewport" content="width=device-width, initial-scale=1.0">
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<title>awk Command Explanation</title>
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<link rel="stylesheet" href="style.css">
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</head>
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<body>
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<div class="container">
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<h1>Understanding the <code>awk</code> Command</h1>
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<section>
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<h2>Basic Usage of <code>awk</code></h2>
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<p>The <code>awk</code> command is a powerful tool for pattern scanning and processing in text files. It processes each line in a file, splitting them into fields based on a delimiter and performing actions on these fields.</p>
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<div class="code-block">
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<code>awk 'pattern { action }' [file...]</code>
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</div>
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<p>Where <code>pattern</code> is the condition for processing a line and <code>action</code> is the operation performed on the matched lines.</p>
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</section>
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<section>
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<h2>Options Available with <code>awk</code></h2>
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<h3><code>awk '{print}' [file]</code> (Basic Output)</h3>
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<p>Prints each line of the file:</p>
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<div class="code-block">
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<code>awk '{print}' file.txt</code>
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</div>
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<p>This command prints all lines from <code>file.txt</code> without any filtering.</p>
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<h3><code>awk '{print $1}' [file]</code> (Print Specific Fields)</h3>
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<p>Prints the first field from each line:</p>
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<div class="code-block">
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<code>awk '{print $1}' file.txt</code>
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</div>
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<p>This will print only the first word or field from each line in the file.</p>
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<h3><code>awk -F ":" '{print $1}' [file]</code> (Custom Field Separator)</h3>
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<p>Use a custom field separator (in this case, a colon <code>:</code>):</p>
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<div class="code-block">
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<code>awk -F ":" '{print $1}' file.txt</code>
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</div>
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<p>This prints the first field from each line using the colon as a delimiter, common in files like <code>/etc/passwd</code>.</p>
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<h3><code>awk '/pattern/ {print}' [file]</code> (Pattern Matching)</h3>
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<p>Search for a pattern in the file and print matching lines:</p>
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<div class="code-block">
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<code>awk '/example/ {print}' file.txt</code>
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</div>
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<p>This prints only the lines that contain the word "example".</p>
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<h3><code>awk '{print $1, $3}' [file]</code> (Print Multiple Fields)</h3>
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<p>Print multiple fields from each line:</p>
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<div class="code-block">
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<code>awk '{print $1, $3}' file.txt</code>
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</div>
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<p>This prints both the first and third fields from each line.</p>
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<h3><code>awk 'NR==3' [file]</code> (Print Specific Line)</h3>
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<p>Print only the third line from the file:</p>
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<div class="code-block">
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<code>awk 'NR==3' file.txt</code>
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</div>
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<p>This command outputs the third line of the file.</p>
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<h3><code>awk 'NR==2, NR==4' [file]</code> (Print a Range of Lines)</h3>
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<p>Print a range of lines (e.g., from line 2 to line 4):</p>
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<div class="code-block">
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<code>awk 'NR==2, NR==4' file.txt</code>
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</div>
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<p>This command prints lines 2, 3, and 4 from the file.</p>
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<h3><code>awk '{sum += $1} END {print sum}' [file]</code> (Sum a Field)</h3>
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<p>Sum the values of a specific field:</p>
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<div class="code-block">
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<code>awk '{sum += $1} END {print sum}' file.txt</code>
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</div>
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<p>This command adds all the values in the first field and prints the total.</p>
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<h3><code>awk '{if ($1 > 10) print}' [file]</code> (Conditional Statements)</h3>
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<p>Print lines where the first field is greater than 10:</p>
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<div class="code-block">
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<code>awk '{if ($1 > 10) print}' file.txt</code>
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</div>
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<p>This command only prints lines where the first field has a value greater than 10.</p>
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<h3><code>awk 'BEGIN {print "Header"} {print $1} END {print "Footer"}' [file]</code> (BEGIN and END Blocks)</h3>
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<p>Print a header before processing and a footer after processing:</p>
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<div class="code-block">
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<code>awk 'BEGIN {print "Header"} {print $1} END {print "Footer"}' file.txt</code>
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</div>
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<p>This prints "Header" first, then the first field from each line, followed by "Footer" at the end.</p>
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<h3><code>awk --help</code></h3>
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<p>Displays help information for the <code>awk</code> command:</p>
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<div class="code-block">
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<code>awk --help</code>
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</div>
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</section>
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<section>
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<h2>Summary of Options</h2>
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<table>
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<thead>
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<tr>
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<th>Option</th>
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<th>Description</th>
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</tr>
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</thead>
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<tbody>
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<tr>
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<td><code>awk '{print}' [file]</code></td>
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<td>Prints each line from the file.</td>
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</tr>
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<tr>
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<td><code>awk '{print $1}' [file]</code></td>
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<td>Prints the first field of each line.</td>
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</tr>
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<tr>
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<td><code>awk -F ":" '{print $1}' [file]</code></td>
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<td>Use a colon as the field delimiter.</td>
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</tr>
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<tr>
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<td><code>awk '/pattern/ {print}' [file]</code></td>
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<td>Print lines that match a given pattern.</td>
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</tr>
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<tr>
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<td><code>awk '{print $1, $3}' [file]</code></td>
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<td>Print multiple fields.</td>
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</tr>
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<tr>
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<td><code>awk 'NR==3' [file]</code></td>
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<td>Print only the third line from the file.</td>
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</tr>
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<tr>
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<td><code>awk 'NR==2, NR==4' [file]</code></td>
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<td>Print a range of lines (from line 2 to 4).</td>
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</tr>
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<tr>
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<td><code>awk '{sum += $1} END {print sum}' [file]</code></td>
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<td>Sum the values of a field.</td>
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</tr>
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<tr>
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<td><code>awk '{if ($1 > 10) print}' [file]</code></td>
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<td>Print lines where the first field is greater than 10.</td>
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</tr>
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<tr>
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<td><code>awk 'BEGIN {print "Header"} {print $1} END {print "Footer"}' [file]</code></td>
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<td>Print a header, process lines, and print a footer.</td>
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</tr>
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<tr>
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<td><code>awk --help</code></td>
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<td>Display help information for <code>awk</code>.</td>
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</tr>
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</tbody>
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</table>
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</section>
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<section>
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<h2>Manual Pages</h2>
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<p>For more detailed information, use the manual page for the <code>awk</code> command:</p>
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<div class="code-block">
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<code>man awk</code>
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</div>
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</section>
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</div>
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</body>
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</html>

‎FSTP2/awk/style.css

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* {
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margin: 0;
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padding: 0;
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box-sizing: border-box;
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}
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body {
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font-family: Arial, sans-serif;
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background-color: #f9f9f9;
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color: #333;
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line-height: 1.6;
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}
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.container {
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max-width: 800px;
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margin: 40px auto;
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padding: 20px;
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background-color: #fff;
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border-radius: 8px;
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box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
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}
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h1 {
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color: #1e90ff;
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margin-bottom: 20px;
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}
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h2 {
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color: #1e90ff;
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margin-top: 20px;
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}
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h3 {
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margin-top: 15px;
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color: #444;
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}
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p {
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margin-bottom: 15px;
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}
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ul {
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margin-top: 10px;
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padding-left: 20px;
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}
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li {
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margin-bottom: 10px;
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}
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.code-block {
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background-color: #f4f4f4;
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padding: 10px;
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border-left: 3px solid #1e90ff;
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margin: 10px 0;
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font-family: monospace;
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}
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code {
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font-family: monospace;
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color: #c7254e;
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background-color: #f9f2f4;
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padding: 2px 4px;
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border-radius: 4px;
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}
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table {
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width: 100%;
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border-collapse: collapse;
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margin-top: 15px;
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}
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thead {
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background-color: #1e90ff;
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color: #fff;
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}
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th, td {
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padding: 10px;
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border: 1px solid #ddd;
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text-align: left;
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}
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tbody tr:nth-child(even) {
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background-color: #f4f4f4;
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}

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