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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2 Final//EN"><html><head><!-- Copyright 1997 The Open Group, All Rights Reserved --><title>pr</title></head><body bgcolor=white><center><font size=2>The Single UNIX ® Specification, Version 2<br>Copyright © 1997 The Open Group</font></center><hr size=2 noshade><h4><a name = "tag_001_014_1745"> </a>NAME</h4><blockquote>pr - print files</blockquote><h4><a name = "tag_001_014_1746"> </a>SYNOPSIS</h4><blockquote><pre><code>pr <b>[</b>+<i>page</i><b>][</b>-<i>column</i><b>][</b>-adFmrt<b>][</b>-e<b>[</b><i>char</i><b>][</b><i>gap</i><b>]][</b>-h <i>header</i><b>][</b>-i<b>[</b><i>char</i><b>][</b><i>gap</i><b>]][</b>-l <i>lines</i><b>][</b>-n<b>[</b><i>char</i><b>][</b><i>width</i><b>]][</b>-o <i>offset</i><b>][</b>-s<b>[</b><i>char</i><b>]][</b>-w <i>width</i><b>][</b>-fp<b>][</b><i>file</i>...<b>]</b></code></pre></blockquote><h4><a name = "tag_001_014_1747"> </a>DESCRIPTION</h4><blockquote>The<i>pr</i>utilityis a printing and pagination filter.If multiple input files are specified, each is read, formatted,and written to standard output.By default, the input is separated into66-line pages, each with:<ul><p><li>a 5-line header that includes the page number, date, time andthe pathname of the file<p><li>a 5-line trailer consisting of blank lines.<p></ul><p>If standard output is associated with a terminal,diagnostic messages will be deferred until the<i>pr</i>utility has completed processing.<p>When options specifying multi-column output are specified,output text columns will be of equal width;input lines that do not fit into a text column will be truncated.By default, text columns are separated with at least oneblank character.</blockquote><h4><a name = "tag_001_014_1748"> </a>OPTIONS</h4><blockquote>The<i>pr</i>utility supports the <b>XBD</b> specification, <a href="../xbd/utilconv.html#usg"><b>Utility Syntax Guidelines</b> </a> ,except that:the<i>page</i>option has a"+"delimiter;<i>page</i>and<i>column</i>can be multi-digit numbers; some of the option-argumentsare optional; and some of the option-arguments cannot be specifiedas separate arguments from the preceding option letter.In particular, the<b>-s</b>option does not allow the optionletter to be separated from its argument, and the options<b>-e</b>,<b>-i</b>and<b>-n</b>require that both arguments, if present, not beseparated from the option letter.<p>The following options are supported.In the following option descriptions,<i>column</i>,<i>lines</i>,<i>offset</i>,<i>page</i>and<i>width</i>are positive decimal integers;<i>gap</i>is a non-negative decimal integer.<dl compact><dt>+<i>page</i><dd>Begin output at page number<i>page</i>of the formatted input.<dt><b>-</b><i>column</i><dd>Produce multi-column output that is arranged in<i>column</i>columns (default is 1) and iswritten down each column in theorder in which the text is received from the input file.This option should not be used with<b>-m</b>.The options<b>-e</b>and<b>-i</b>will be assumed for multiple text-column output.Whether or not text columns areproduced with identical vertical lengths is unspecified,but a text columnwill never exceed the length of the page (see the<b>-l</b>option).When used with<b>-t</b>,use the minimum number of lines to write the output.<dt><b>-a</b><dd>Modify the effect of the<i>-column</i>option so that the columns are filledacross the page in a round-robin order(for example, when<i>column</i>is 2, the first input line heads column 1,the second heads column 2, the third is the second line in column 1,and so on).<dt><b>-d</b><dd>Produce output that is double-spaced;append an extranewline characterfollowing everynewline characterfound in the input.<dt><b>-e[</b><i>char</i><b>][</b><i>gap</i><b>]</b><dd>Expand each inputtab characterto the next greater column position specified by the formula<i>n*gap</i>+1where<i>n</i>is an integer > 0.If<i>gap</i>is zero or is omitted,it defaults to 8.Alltabcharacters in the input will be expanded into the appropriate number ofspace characters.If any non-digit character,<i>char</i>,is specified, it will be used as the input tab character.<dt><b>-f</b><dd>Use aform-feedcharacter for new pages, instead of the default behaviourthat uses a sequence ofnewlinecharacters.Pause before beginning the first page ifthe standard output is associated with a terminal.<dt><b>-F</b><dd>Use aform-feedcharacter for new pages, instead of the default behaviourthat uses a sequence ofnewlinecharacters.<dt><b>-h </b><i>header</i><dd>Use the string<i>header</i>to replace the contents of the<i>file</i>operand in the page header.<dt><b>-i[</b><i>char</i><b>][</b><i>gap</i><b>]</b><dd>In output, replace multiplespace characterswithtab characterswherever two or more adjacentspace charactersreach column positions<i>gap</i>+1,2*<i>gap</i>+1,3*<i>gap</i>+1,and so on.If<i>gap</i>is zero or is omitted, defaulttabsettings at every eighth column position are assumed.If any non-digit character,<i>char</i>,is specified, it will be used as the outputtabcharacter.<dt><b>-l </b><i>lines</i><dd>Override the 66-line default and reset the page length to<i>lines</i>.If<i>lines</i>is not greater thanthe sum of both the header and trailer depths(in lines), the<i>pr</i>utility will suppress both the header and trailer, as if the<b>-t</b>option were in effect.<dt><b>-m</b><dd>Merge files.Standard output will be formatted so the<i>pr</i>utility writes one line from each file specified by a<i>file</i>operand, side by side into text columns of equalfixed widths, in terms of the number of column positions.Implementations support merging of at least nine<i>file</i>operands.<dt><b>-n[</b><i>char</i><b>][</b><i>width</i><b>]</b><dd>Provide<i>width</i>-digitline numbering (default for<i>width</i>is 5).The number will occupy the first<i>width</i>column positions of each text columnof default output or each line of<b>-m</b>output.If<i>char</i>(any non-digit character) is given, it will be appended to the line numberto separate it from whatever follows (default for<i>char</i>is atab character).<dt><b>-o </b><i>offset</i><dd>Each line of output will be preceded by offset <space>s.If the<b>-o</b>option is not specified, the default offset is zero.The space taken will be in addition to the output line width (see<b>-w</b>option below).<dt><b>-p</b><dd>Pause before beginning each page if thestandard output is directed to a terminal(<i>pr</i>will write an alert character to standard error and wait for acarriage-return character to be read on<b>/dev/tty</b>).<dt><b>-r</b><dd>Write no diagnostic reports on failure to open files.<dt><b>-s[</b><i>char</i><b>]</b><dd>Separate text columns by the single character<i>char</i>instead of by the appropriate number ofspace characters(default for<i>char</i>is thetabcharacter).<dt><b>-t</b><dd>Write neither the five-line identifying header nor the five-linetrailer usually supplied for each page.Quit writing after the lastline of each file without spacing to the end of the page.<dt><b>-w </b><i>width</i><dd>Set the width of the line to<i>width</i>column positions for multiple text-column output only.If the<b>-w</b>option is not specified and the<b>-s</b>option isnot specified, the default width is 72.If the<b>-w</b>option is not specified and the<b>-s</b>option is specified, the default width is 512.For single column output, input lines will not be truncated.</dl><br></blockquote><h4><a name = "tag_001_014_1749"> </a>OPERANDS</h4><blockquote>The following operand is supported:<dl compact><dt><i>file</i><dd>A pathname of a file to be written.If no<i>file</i>operands are specified,or if a<i>file</i>operand is "-", the standard input will be used.</dl></blockquote><h4><a name = "tag_001_014_1750"> </a>STDIN</h4><blockquote>The standard input will be used only if no<i>file</i>operands are specified,or if a<i>file</i>operand is "-".See the INPUT FILES section.</blockquote><h4><a name = "tag_001_014_1751"> </a>INPUT FILES</h4><blockquote>The input files must be text files.<p>The file<b>/dev/tty</b>is used to read responses required by the<b>-p</b>option.</blockquote><h4><a name = "tag_001_014_1752"> </a>ENVIRONMENT VARIABLES</h4><blockquote>The following environment variables affect the execution of<i>pr</i>:<dl compact><dt><i>LANG</i><dd>Provide a default value for the internationalisation variablesthat are unset or null.If<i>LANG</i>is unset or null, the corresponding value from theimplementation-dependent default locale will be used.If any of the internationalisation variables contains an invalid setting, theutility will behave as if none of the variables had been defined.<dt><i>LC_ALL</i><dd>If set to a non-empty string value,override the values of all the other internationalisation variables.<dt><i>LC_CTYPE</i><dd>Determine thelocale for the interpretation of sequences of bytes of text data ascharacters (for example, single-versus multi-byte characters in arguments and input files)and which characters are defined asprintable (character class<b>print</b>).Non-printable characters still will be written to standard output,but are not counted for the purpose for column-widthand line-length calculations.<dt><i>LC_MESSAGES</i><dd>Determine the locale that should be used to affectthe format and contents of diagnosticmessages written to standard error.<dt><i>LC_TIME</i><dd>Determine theformat of the date and time for use in writing header lines.<dt><i>NLSPATH</i><dd>Determine the location of message cataloguesfor the processing of<i>LC_MESSAGES .</i><dt><i>TZ</i><dd>Determine thetimezone for use in writing header lines.</dl></blockquote><h4><a name = "tag_001_014_1753"> </a>ASYNCHRONOUS EVENTS</h4><blockquote>If<i>pr</i>receives an interrupt while writing to a terminal,it will flush all accumulated error messages to the screen before terminating.</blockquote><h4><a name = "tag_001_014_1754"> </a>STDOUT</h4><blockquote>The<i>pr</i>utility output will be a paginated version of the original file (or files).This pagination will be accomplished using eitherform-feed charactersor a sequence ofnewline characters,as controlled by the<b>-F</b>or<b>-f</b>option.Page headers will be generated unless the<b>-t</b>option is specified.The page headers will be of the form:<p><code><pre><tt>"\n\n%s %s Page %d\n\n\n"</tt>, <<i>output of </i>date>,<<i>file</i>>,<<i>page number</i>></pre></code><p>In the POSIX locale, the<<i>output of date</i>>field, representing the date and timeof last modification of the input file (or the current date and time ifthe input file is standard input),is equivalent to the output of thefollowing command as it would appear if executed at the given time:<pre><code>date "+%b %e %H:%M %Y"</code></pre>without the trailing newline character,if the page being written is from standard input.If the page being written is notfrom standard input, in the POSIX locale, thesame format will be used, but the time used will be the modificationtime of the file corresponding to<i>file</i>instead of the current time.When the LC_TIME locale category is not set to the POSIX locale,a different format and order of presentation of thisfield may be used.<p>If the standard input is used instead of a<i>file</i>operand,the<<i>file</i>>field will be replaced by a null string.<p>If the<b>-h</b>option is specified, the<<i>file</i>>field will be replaced by the<i>header</i>argument.</blockquote><h4><a name = "tag_001_014_1755"> </a>STDERR</h4><blockquote>Used for diagnostic messagesand for alerting the terminal when<b>-p</b>is specified.</blockquote><h4><a name = "tag_001_014_1756"> </a>OUTPUT FILES</h4><blockquote>None.</blockquote><h4><a name = "tag_001_014_1757"> </a>EXTENDED DESCRIPTION</h4><blockquote>None.</blockquote><h4><a name = "tag_001_014_1758"> </a>EXIT STATUS</h4><blockquote>The following exit values are returned:<dl compact><dt>0<dd>All files were written successfully.<dt>>0<dd>An error occurred.</dl></blockquote><h4><a name = "tag_001_014_1759"> </a>CONSEQUENCES OF ERRORS</h4><blockquote>Default.</blockquote><h4><a name = "tag_001_014_1760"> </a>APPLICATION USAGE</h4><blockquote>None.</blockquote><h4><a name = "tag_001_014_1761"> </a>EXAMPLES</h4><blockquote><ol><p><li>Print a numbered list of all files in the current directory:<pre><code>ls -a | pr -n -h "Files in $(pwd)."</code></pre><p><li>Print<b>file1</b>and<b>file2</b>as a double-spaced, three-column listingheaded by "file list":<pre><code>pr -3d -h "file list" file1 file2</code></pre><p><li>Write<b>file1</b>on<b>file2</b> ,expanding tabs to columns 10, 19, 28, ... :<pre><code>pr -e9 -t <file1 >file2</code></pre><p></ol></blockquote><h4><a name = "tag_001_014_1762"> </a>FUTURE DIRECTIONS</h4><blockquote>It is possible that a new interface that conforms to theUtility Syntax Guidelines will be introduced.</blockquote><h4><a name = "tag_001_014_1763"> </a>SEE ALSO</h4><blockquote><i><a href="expand.html">expand</a></i>,<i><a href="lp.html">lp</a></i>.<br></blockquote><hr size=2 noshade><center><font size=2>UNIX ® is a registered Trademark of The Open Group.<br>Copyright © 1997 The Open Group<br> [ <a href="../index.html">Main Index</a> | <a href="../xshix.html">XSH</a> | <a href="../xcuix.html">XCU</a> | <a href="../xbdix.html">XBD</a> | <a href="../cursesix.html">XCURSES</a> | <a href="../xnsix.html">XNS</a> ]</font></center><hr size=2 noshade></body></html>⌨️ 快捷键说明
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