📄 ch17_07.htm
字号:
<HTML><!--Distributed by F --><HEAD><TITLE>[Chapter 17] 17.7 The Times that find Finds </TITLE><METANAME="DC.title"CONTENT="UNIX Power Tools"><METANAME="DC.creator"CONTENT="Jerry Peek, Tim O'Reilly & Mike Loukides"><METANAME="DC.publisher"CONTENT="O'Reilly & Associates, Inc."><METANAME="DC.date"CONTENT="1998-08-04T21:38:21Z"><METANAME="DC.type"CONTENT="Text.Monograph"><METANAME="DC.format"CONTENT="text/html"SCHEME="MIME"><METANAME="DC.source"CONTENT="1-56592-260-3"SCHEME="ISBN"><METANAME="DC.language"CONTENT="en-US"><METANAME="generator"CONTENT="Jade 1.1/O'Reilly DocBook 3.0 to HTML 4.0"><LINKREV="made"HREF="mailto:online-books@oreilly.com"TITLE="Online Books Comments"><LINKREL="up"HREF="ch17_01.htm"TITLE="17. Finding Files with find"><LINKREL="prev"HREF="ch17_06.htm"TITLE="17.6 Be an Expert on find Search Operators "><LINKREL="next"HREF="ch17_08.htm"TITLE="17.8 Exact File Time Comparisons "></HEAD><BODYBGCOLOR="#FFFFFF"TEXT="#000000"><DIVCLASS="htmlnav"><H1><IMGSRC="gifs/smbanner.gif"ALT="UNIX Power Tools"USEMAP="#srchmap"BORDER="0"></H1><MAPNAME="srchmap"><AREASHAPE="RECT"COORDS="0,0,466,58"HREF="index.htm"ALT="UNIX Power Tools"><AREASHAPE="RECT"COORDS="467,0,514,18"HREF="jobjects/fsearch.htm"ALT="Search this book"></MAP><TABLEWIDTH="515"BORDER="0"CELLSPACING="0"CELLPADDING="0"><TR><TDALIGN="LEFT"VALIGN="TOP"WIDTH="172"><ACLASS="SECT1"HREF="ch17_06.htm"TITLE="17.6 Be an Expert on find Search Operators "><IMGSRC="gifs/txtpreva.gif"SRC="gifs/txtpreva.gif"ALT="Previous: 17.6 Be an Expert on find Search Operators "BORDER="0"></A></TD><TDALIGN="CENTER"VALIGN="TOP"WIDTH="171"><B><FONTFACE="ARIEL,HELVETICA,HELV,SANSERIF"SIZE="-1">Chapter 17<BR>Finding Files with find</FONT></B></TD><TDALIGN="RIGHT"VALIGN="TOP"WIDTH="172"><ACLASS="SECT1"HREF="ch17_08.htm"TITLE="17.8 Exact File Time Comparisons "><IMGSRC="gifs/txtnexta.gif"SRC="gifs/txtnexta.gif"ALT="Next: 17.8 Exact File Time Comparisons "BORDER="0"></A></TD></TR></TABLE> <HRALIGN="LEFT"WIDTH="515"TITLE="footer"></DIV><DIVCLASS="SECT1"><H2CLASS="sect1"><ACLASS="title"NAME="UPT-ART-0292">17.7 The Times that find Finds </A></H2><PCLASS="para"><ACLASS="indexterm"NAME="AUTOID-18736"></A><ACLASS="indexterm"NAME="AUTOID-18739"></A><ACLASS="indexterm"NAME="AUTOID-18742"></A>The times that go with the <EMCLASS="emphasis">find</EM> operators<SPANCLASS="link"><EMCLASS="emphasis">-mtime</EM>, <EMCLASS="emphasis">-atime</EM>, and <EMCLASS="emphasis">-ctime</EM> (<ACLASS="linkend"HREF="ch17_04.htm"TITLE="Looking for Files with Particular Names ">17.4</A>)</SPAN>aren't documented very well.The times are in days:</P><ULCLASS="itemizedlist"><LICLASS="listitem"><PCLASS="para">A number with no sign, for example, <CODECLASS="literal">3</CODE> (as in <EMCLASS="emphasis">-mtime 3</EM> or<EMCLASS="emphasis">-atime 3</EM>), means the 24-hour period that <EMCLASS="emphasis">ended</EM> exactlythree days ago (in other words, between 96 and 72 hours ago).</P></LI><LICLASS="listitem"><PCLASS="para">A number with a minus sign (<CODECLASS="literal">-</CODE>) refers to the period<EMCLASS="emphasis">since</EM> that time.For example, <CODECLASS="literal">-3</CODE> (as in <EMCLASS="emphasis">-mtime -3</EM>) is any timebetween now and three days ago (in other words, between 0 and 72 hours ago).</P></LI><LICLASS="listitem"><PCLASS="para">Naturally, a number with a plus sign (<CODECLASS="literal">+</CODE>) refers to the 24-hour period<EMCLASS="emphasis">before</EM> that time.For example, <CODECLASS="literal">+3</CODE> (as in <EMCLASS="emphasis">-mtime +3</EM>) is any timemore than three days ago (in other words, more than 96 hours ago).</P></LI></UL><PCLASS="para">Got that?Then you should see that <EMCLASS="emphasis">-atime -2</EM> and <EMCLASS="emphasis">-atime 1</EM>are both true on files that have been accessed between 48 and 24 hours ago.(<EMCLASS="emphasis">-atime -2</EM> is also true on files accessed 24 hours or less ago.)</P><PCLASS="para">For more exact comparisons,<SPANCLASS="link">use <EMCLASS="emphasis">find -newer</EM> with <EMCLASS="emphasis">touch</EM> (<ACLASS="linkend"HREF="ch17_08.htm"TITLE="Exact File Time Comparisons ">17.8</A>)</SPAN>.</P><DIVCLASS="sect1info"><PCLASS="SECT1INFO">- <SPANCLASS="authorinitials">JP</SPAN></P></DIV></DIV><DIVCLASS="htmlnav"><P></P><HRALIGN="LEFT"WIDTH="515"TITLE="footer"><TABLEWIDTH="515"BORDER="0"CELLSPACING="0"CELLPADDING="0"><TR><TDALIGN="LEFT"VALIGN="TOP"WIDTH="172"><ACLASS="SECT1"HREF="ch17_06.htm"TITLE="17.6 Be an Expert on find Search Operators "><IMGSRC="gifs/txtpreva.gif"SRC="gifs/txtpreva.gif"ALT="Previous: 17.6 Be an Expert on find Search Operators "BORDER="0"></A></TD><TDALIGN="CENTER"VALIGN="TOP"WIDTH="171"><ACLASS="book"HREF="index.htm"TITLE="UNIX Power Tools"><IMGSRC="gifs/txthome.gif"SRC="gifs/txthome.gif"ALT="UNIX Power Tools"BORDER="0"></A></TD><TDALIGN="RIGHT"VALIGN="TOP"WIDTH="172"><ACLASS="SECT1"HREF="ch17_08.htm"TITLE="17.8 Exact File Time Comparisons "><IMGSRC="gifs/txtnexta.gif"SRC="gifs/txtnexta.gif"ALT="Next: 17.8 Exact File Time Comparisons "BORDER="0"></A></TD></TR><TR><TDALIGN="LEFT"VALIGN="TOP"WIDTH="172">17.6 Be an Expert on find Search Operators </TD><TDALIGN="CENTER"VALIGN="TOP"WIDTH="171"><ACLASS="index"HREF="index/idx_0.htm"TITLE="Book Index"><IMGSRC="gifs/index.gif"SRC="gifs/index.gif"ALT="Book Index"BORDER="0"></A></TD><TDALIGN="RIGHT"VALIGN="TOP"WIDTH="172">17.8 Exact File Time Comparisons </TD></TR></TABLE><HRALIGN="LEFT"WIDTH="515"TITLE="footer"><IMGSRC="gifs/smnavbar.gif"SRC="gifs/smnavbar.gif"USEMAP="#map"BORDER="0"ALT="The UNIX CD Bookshelf Navigation"><MAPNAME="map"><AREASHAPE="RECT"COORDS="0,0,73,21"HREF="../index.htm"ALT="The UNIX CD Bookshelf"><AREASHAPE="RECT"COORDS="74,0,163,21"HREF="index.htm"ALT="UNIX Power Tools"><AREASHAPE="RECT"COORDS="164,0,257,21"HREF="../unixnut/index.htm"ALT="UNIX in a Nutshell"><AREASHAPE="RECT"COORDS="258,0,321,21"HREF="../vi/index.htm"ALT="Learning the vi Editor"><AREASHAPE="RECT"COORDS="322,0,378,21"HREF="../sedawk/index.htm"ALT="sed & awk"><AREASHAPE="RECT"COORDS="379,0,438,21"HREF="../ksh/index.htm"ALT="Learning the Korn Shell"><AREASHAPE="RECT"COORDS="439,0,514,21"HREF="../lrnunix/index.htm"ALT="Learning the UNIX Operating System"></MAP></DIV></BODY></HTML>⌨️ 快捷键说明
复制代码
Ctrl + C
搜索代码
Ctrl + F
全屏模式
F11
切换主题
Ctrl + Shift + D
显示快捷键
?
增大字号
Ctrl + =
减小字号
Ctrl + -