CVSROOT: /web/grep Module name: grep Changes by: Karl Berry <karl> 09/05/24 18:43:01
Index: manual/html_node/Other-Options.html =================================================================== RCS file: manual/html_node/Other-Options.html diff -N manual/html_node/Other-Options.html --- /dev/null 1 Jan 1970 00:00:00 -0000 +++ manual/html_node/Other-Options.html 24 May 2009 18:42:59 -0000 1.1 @@ -0,0 +1,82 @@ +<html lang="en"> +<head> +<title>Other Options - GNU Grep 2.5.4</title> +<meta http-equiv="Content-Type" content="text/html"> +<meta name="description" content="GNU Grep 2.5.4"> +<meta name="generator" content="makeinfo 4.13"> +<link title="Top" rel="start" href="index.html#Top"> +<link rel="up" href="Command_002dline-Options.html#Command_002dline-Options" title="Command-line Options"> +<link rel="prev" href="File-and-Directory-Selection.html#File-and-Directory-Selection" title="File and Directory Selection"> +<link href="http://www.gnu.org/software/texinfo/"; rel="generator-home" title="Texinfo Homepage"> +<!-- +This manual is for `grep', a pattern matching engine. + +Copyright (C) 1999, 2000, 2001, 2002, 2005, 2008, 2009 Free +Software Foundation, Inc. + + Permission is granted to copy, distribute and/or modify this + document under the terms of the GNU Free Documentation License, + Version 1.3 or any later version published by the Free Software + Foundation; with no Invariant Sections, with no Front-Cover Texts, + and with no Back-Cover Texts. A copy of the license is included + in the section entitled ``GNU Free Documentation License''. + --> +<meta http-equiv="Content-Style-Type" content="text/css"> +<style type="text/css"><!-- + pre.display { font-family:inherit } + pre.format { font-family:inherit } + pre.smalldisplay { font-family:inherit; font-size:smaller } + pre.smallformat { font-family:inherit; font-size:smaller } + pre.smallexample { font-size:smaller } + pre.smalllisp { font-size:smaller } + span.sc { font-variant:small-caps } + span.roman { font-family:serif; font-weight:normal; } + span.sansserif { font-family:sans-serif; font-weight:normal; } +--></style> +</head> +<body> +<div class="node"> +<a name="Other-Options"></a> +<p> +Previous: <a rel="previous" accesskey="p" href="File-and-Directory-Selection.html#File-and-Directory-Selection">File and Directory Selection</a>, +Up: <a rel="up" accesskey="u" href="Command_002dline-Options.html#Command_002dline-Options">Command-line Options</a> +<hr> +</div> + +<h4 class="subsection">2.1.7 Other Options</h4> + + <dl> +<dt>‘<samp><span class="samp">--line-buffered</span></samp>’<dd><a name="index-g_t_002d_002dline_002dbuffered-115"></a><a name="index-line-buffering-116"></a>Use line buffering on output. +This can cause a performance penalty. + + <br><dt>‘<samp><span class="samp">--mmap</span></samp>’<dd><a name="index-g_t_002d_002dmmap-117"></a><a name="index-memory-mapped-input-118"></a>If possible, use the <code>mmap</code> system call to read input, +instead of the default <code>read</code> system call. +In some situations, ‘<samp><span class="samp">--mmap</span></samp>’ yields better performance. +However, ‘<samp><span class="samp">--mmap</span></samp>’ can cause undefined behavior (including core dumps) +if an input file shrinks while <samp><span class="command">grep</span></samp> is operating, +or if an I/O error occurs. + + <br><dt>‘<samp><span class="samp">-U</span></samp>’<dt>‘<samp><span class="samp">--binary</span></samp>’<dd><a name="index-g_t_002dU-119"></a><a name="index-g_t_002d_002dbinary-120"></a><a name="index-g_t_0040sc_007bms_002ddos_007d_002f_0040sc_007bms_007d_002dWindows-binary-files-121"></a><a name="index-binary-files_002c-_0040sc_007bms_002ddos_007d_002f_0040sc_007bms_007d_002dWindows-122"></a>Treat the file(s) as binary. +By default, under <span class="sc">ms-dos</span> and <span class="sc">ms</span>-Windows, +<samp><span class="command">grep</span></samp> guesses the file type +by looking at the contents of the first 32kB read from the file. +If <samp><span class="command">grep</span></samp> decides the file is a text file, +it strips the <code>CR</code> characters from the original file contents +(to make regular expressions with <code>^</code> and <code>$</code> work correctly). +Specifying ‘<samp><span class="samp">-U</span></samp>’ overrules this guesswork, +causing all files to be read and passed to the matching mechanism verbatim; +if the file is a text file with <code>CR/LF</code> pairs at the end of each line, +this will cause some regular expressions to fail. +This option has no effect +on platforms other than <span class="sc">ms-dos</span> and <span class="sc">ms</span>-Windows. + + <br><dt>‘<samp><span class="samp">-z</span></samp>’<dt>‘<samp><span class="samp">--null-data</span></samp>’<dd><a name="index-g_t_002dz-123"></a><a name="index-g_t_002d_002dnull_002ddata-124"></a><a name="index-zero_002dterminated-lines-125"></a>Treat the input as a set of lines, each terminated by a zero byte (the +<span class="sc">ascii</span> <code>NUL</code> character) instead of a newline. +Like the ‘<samp><span class="samp">-Z</span></samp>’ or ‘<samp><span class="samp">--null</span></samp>’ option, +this option can be used with commands like +‘<samp><span class="samp">sort -z</span></samp>’ to process arbitrary file names. + +</dl> + + </body></html> +
