117 lines
3.1 KiB
HTML
117 lines
3.1 KiB
HTML
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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 3.2 Final//EN">
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<html>
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<head>
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<meta name="generator" content="HTML Tidy, see www.w3.org">
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<meta http-equiv="Content-Type" content=
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"text/html; charset=utf-8">
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<title>cmp - Compare two files</title>
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<LINK rel="stylesheet" type="text/css" href="../rzahg/ic.css">
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</HEAD>
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<body bgcolor="#FFFFFF">
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<!-- Java sync-link -->
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<SCRIPT LANGUAGE="Javascript" SRC="../rzahg/synch.js" TYPE="text/javascript"></SCRIPT>
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<h2>cmp - Compare two files</h2>
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<strong>Synopsis</strong>
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<p><strong>cmp [-l | -s] [-t]</strong> <em>file1 file2</em>
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[<em>skip1</em> [<em>skip2</em>]]</p>
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<p><strong>Description</strong></p>
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<p>You can use <strong>cmp</strong> to compare two files. By
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default, a byte for byte binary comparison is done. If no
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differences are found, no output is written. If no option flags are
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specified, <strong>cmp</strong> writes a message with the byte and
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line number of the first difference and exits with an error. Bytes
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and lines are numbered beginning with 1.</p>
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<p><strong>Options</strong></p>
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<dl>
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<dt><strong>-l</strong></dt>
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<dd>(Lower case ell) Write the byte number in decimal and the
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differing bytes in octal for all differences.</dd>
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<dt><strong>-s</strong></dt>
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<dd>Silent mode where no output is written for differing files;
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only the exit status is set.</dd>
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<dt><strong>-t</strong></dt>
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<dd>Text mode where the files are opened in text mode and
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translated to the CCSID of the job before comparing byte for
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byte.</dd>
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</dl>
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<p><strong>Operands</strong></p>
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<p>The <em>file1</em> and <em>file2</em> operands are the two files
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to be compared byte for byte. The optional <em>skip1</em> and <em>
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skip2</em> are the number of bytes to skip from the beginning of
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each file, respectively, before the comparison begins.</p>
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<p><img src="delta.gif" alt="Start of change"><strong>Environment Variables</strong></p>
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<p><strong>cmp</strong> is affected by the following environment
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variables:</p>
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<dl>
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<dt><strong>QIBM_CMP_FILE_SIZE</strong></dt>
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<dd>Controls the maximum file size in bytes that <strong>cmp</strong> reads
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into an internal buffer for better performance. For files larger than the
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maximum size, <strong>cmp</strong> reads the files one byte at a time.</dd>
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</dl><img src="deltaend.gif" alt="End of change">
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<p><strong>Exit Status</strong></p>
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<ul>
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<li>0 when the files are identical</li>
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<li>1 when the files are different</li>
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<li>>1 when an error occurred</li>
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</ul>
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<p><strong>Related information</strong></p>
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<ul>
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<li><a href="sed.htm">sed - Stream editor</a></li>
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<li><a href="sort.htm">sort - Sort, merge, or sequence check text
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files</a></li>
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<li><a href="split.htm">split - Split files into pieces</a></li>
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<li><a href="uniq.htm">uniq - Report or filter out repeated lines
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in a file</a></li>
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</ul>
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<strong>Examples</strong>
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<ol>
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<li>Find the exact position where two files differ. It is better to
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place the reference or good file first and then the changed or new
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file second.
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<pre>
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cmp myApplet.java.old myApplet.java.new
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</pre>
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</li>
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</ol>
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<!-- end ibmbody========================================================= -->
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</body>
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</html>
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