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+<title>popen function</title>
+
+<head>
+<script language="JavaScript">
+</script>
+</head>
+
+<body bgcolor=#ffffcc>
+<hr>
+<center>
+<h1>popen function</h1>
+</center>
+<hr>
+<p>
+<b>popen</b> is used to read and write to a unix pipe.<p> This function is NOT
+included in 'C Programming Language' (ANSI) but can be found in 'The Standard
+C Library' book.
+
+<pre>
+Library:   stdio.h
+
+Prototype: FILE *popen(const char *command, const char *type);
+
+Syntax:    FILE *fp;
+	   fp = popen( "ls -l", "r");
+
+Notes:
+	command - is the command to be issued.
+	type    - r - read O/P from command.
+                - w - Write data as I/P to command.
+
+</pre>
+<hr>
+<h2>Examples:</h2>
+<img src=../../GRAPHICS/computer.gif></a>
+<a href=../EXAMPLES/popen.c> example program.</a><p>
+
+<hr>
+<h2>Notes:</h2>
+<ul>
+<li>popen will always execute the command from within the Bourne shell.
+<li>popen feeds the STDOUT back to your program. If you want STDERR, 
+the following will do the trick.
+<pre>
+	fp=popen("ls -l 2>&1", "w");
+		        AAAA
+		        ||||
+</pre>
+</ul>
+<hr>
+<h2>See Also:</h2>
+<ul>
+<li><a href=fgetc.html>fgetc</a> Get a character from a file.
+<li><a href=files.html>fputc</a> Put a character into a file.<i>man pages</i>
+<li><a href=fprintf.html>fprintf</a> Put a formatted line into a file.
+<li><a href=fopen.html>fopen</a> Open a file.
+<li><a href=fclose.html>fclose</a> Close a file.
+<li><a href=pclose.html>pclose</a> Close a pipe.
+<li><a href=system.html>system</a> Open a pipe.
+</ul>
+
+
+<p>
+
+<hr>
+<p>
+<center>
+<table border=2 width="80%" bgcolor="ivory">
+<tr align=center>
+<td width="25%">
+<a href="../cref.html">                  Top</a>
+</td><td width="25%">
+<a href="../master_index.html">          Master Index</a>
+</td><td width="25%">
+<a href="../SYNTAX/keywords.html">                 Keywords</a>
+</td><td width="25%">
+<a href="funcref.htm">      Functions</a>
+</td>
+</tr>
+</table>
+</center>
+<p>
+<hr>
+<address>Martin Leslie 
+</address><p>
+</body>
+</html>
+