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<HTML><!--Distributed by F --><HEAD><TITLE>[Chapter 48] 48.12 Using index with a Filter </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="1998-10-23T15:55:40Z"><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="ch48_01.htm"TITLE="48. Office Automation"><LINKREL="prev"HREF="ch48_11.htm"TITLE="48.11 The index Database Program "><LINKREL="next"HREF="ch49_01.htm"TITLE="49. Working with Numbers"></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="ch48_11.htm"TITLE="48.11 The index Database Program "><IMGSRC="gifs/txtpreva.gif"SRC="gifs/txtpreva.gif"ALT="Previous: 48.11 The index Database Program "BORDER="0"></A></TD><TDALIGN="CENTER"VALIGN="TOP"WIDTH="171"><B><FONTFACE="ARIEL,HELVETICA,HELV,SANSERIF"SIZE="-1">Chapter 48<BR>Office Automation</FONT></B></TD><TDALIGN="RIGHT"VALIGN="TOP"WIDTH="172"><ACLASS="CHAPTER"HREF="ch49_01.htm"TITLE="49. Working with Numbers"><IMGSRC="gifs/txtnexta.gif"SRC="gifs/txtnexta.gif"ALT="Next: 49. Working with Numbers"BORDER="0"></A></TD></TR></TABLE> <HRALIGN="LEFT"WIDTH="515"TITLE="footer"></DIV><DIVCLASS="SECT1"><H2CLASS="sect1"><ACLASS="title"NAME="UPT-ART-9028">48.12 Using index with a Filter </A></H2><PCLASS="para"><ACLASS="indexterm"NAME="AUTOID-58388"></A><ACLASS="indexterm"NAME="AUTOID-58391"></A>A particularly useful feature of the<SPANCLASS="link"><EMCLASS="emphasis">index</EM> (<ACLASS="linkend"HREF="ch48_11.htm"TITLE="The index Database Program ">48.11</A>)</SPAN>program is that you can usethe <EMCLASS="emphasis">-f</EM> option to filterthe output. When a filter is used, the <EMCLASS="emphasis">index</EM> program produces output in TAB-separated columns.Instead of listing each matching entry individually,the field titles are shown at the top, and each entry then appearsunderneath, displayed horizontally, with TABs between fields:</P><PCLASS="para"><BLOCKQUOTECLASS="screen"><PRECLASS="screen">% <CODECLASS="userinput"><B>index -f 'sed s/Mui/Mud/' addresses Peter</B></CODE>NAME TITLE ORGANIZATION STREET ADDRESS CITY STATE ...Henry K Smith Peter Johnson & Associates 324 Bur ...Peter Mud International Sales Manager O'Reilly and As ...Peter L. Loos President Introspective Solutions, Inc. ...</PRE></BLOCKQUOTE></P><PCLASS="para"><ACLASS="indexterm"NAME="AUTOID-58402"></A>The TAB-separated fields don't line up properly on your screen, butthey make it convenient to manipulate columns using<SPANCLASS="link"><EMCLASS="emphasis">cut</EM> (<ACLASS="linkend"HREF="ch35_14.htm"TITLE="Cutting Columns or Fields with cut ">35.14</A>)</SPAN>,<SPANCLASS="link"><EMCLASS="emphasis">awk</EM> (<ACLASS="linkend"HREF="ch33_11.htm"TITLE="Quick Reference: awk ">33.11</A>)</SPAN>,or<SPANCLASS="link"><EMCLASS="emphasis">perl</EM> (<ACLASS="linkend"HREF="ch37_01.htm#UPT-ART-5560"TITLE="What We Do and Don't Tell You About Perl ">37.1</A>)</SPAN>.For example, you canuse the <EMCLASS="emphasis">cut</EM> command as your filter to limit the output to a fewsignificant fields:</P><PCLASS="para"><BLOCKQUOTECLASS="screen"><PRECLASS="screen">% <CODECLASS="userinput"><B>index -f 'cut -f1,8,10' addresses '.'</B></CODE>NAME VOICE PHONE NUMBER EMAIL ADDRESSHenry K Smith 617-555-1212 henry@pjaPaul S. Spencer 617-693-1111 paul@lotus.comPeter Mui 800-998-9938 peter@ora.com</PRE></BLOCKQUOTE></P><PCLASS="para">(We use <CODECLASS="literal">'.'</CODE> as the search string to match all entries.)</P><PCLASS="para"><ACLASS="indexterm"NAME="AUTOID-58418"></A><ACLASS="indexterm"NAME="AUTOID-58421"></A><ACLASS="indexterm"NAME="AUTOID-58423"></A>For your convenience, you can write up a shell script as a filterand place it in your <EMCLASS="emphasis">$HOME/.index</EM> directory with a <EMCLASS="emphasis">.fmt</EM>suffix.This feature comes in useful for particularly complicated filterprograms.For example, if you wantto be able to read the output of the previousexample properly, you can try using<EMCLASS="emphasis">awk</EM> as shown in article<ACLASS="xref"HREF="ch35_22.htm"TITLE="Straightening Jagged Columns ">35.22</A>,or you can just use<SPANCLASS="link"><EMCLASS="emphasis">tbl</EM> (<ACLASS="linkend"HREF="ch43_15.htm"TITLE="From a Source File to the Printer ">43.15</A>)</SPAN>and<SPANCLASS="link"><EMCLASS="emphasis">nroff</EM> (<ACLASS="linkend"HREF="ch43_13.htm"TITLE="The Text Formatters nroff, troff, ditroff, ... ">43.13</A>)</SPAN>.To do this in a single step, try writing a filter[Linda is a great typist; she uses<SPANCLASS="link"><CODECLASS="literal">cat >></CODE> (<ACLASS="linkend"HREF="ch25_02.htm"TITLE="Four Ways to Skin a cat ">25.2</A>)</SPAN>to write short shell scripts (and show the script at the same time).A text editor likeEmacs or <EMCLASS="emphasis">vi</EM> will do fine, too, of course. -<EMCLASS="emphasis">JP</EM> ]:</P><PCLASS="para"><TABLECLASS="screen.co"BORDER="1"><TR><THVALIGN="TOP"><PRECLASS="calloutlist"><ACLASS="co"HREF="ch14_11.htm"TITLE="14.11 Finding (Anyone's) Home Directory, Quickly ">~</A> <ACLASS="co"HREF="ch01_05.htm"TITLE="1.5 Anyone Can Program the Shell ">chmod +x</A> </PRE></TH><TDVALIGN="TOP"><PRECLASS="screen"> % <CODECLASS="userinput"><B>cat >> /.index/printinfo.fmt#! /bin/shcut -f1,8,10 | sed '1i\.TS\l l l.$a\.TE' | tbl | nroff | col</B></CODE><KBDCLASS="keycap">[CTRL-d]</KBD>% <CODECLASS="userinput"><B>chmod +x ~/.index/printinfo.fmt</B></CODE>% <CODECLASS="userinput"><B>index -f printinfo addresses '.'</B></CODE>NAME VOICE PHONE NUMBER EMAIL ADDRESSHenry K Smith 617-555-1212 henry@pjaPaul S. Spencer 617-693-1111 paul@lotus.comPeter Mui 800-998-9938 peter@ora.com</PRE></TD></TR></TABLE></P><DIVCLASS="sect1info"><PCLASS="SECT1INFO">- <SPANCLASS="authorinitials">LM</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="ch48_11.htm"TITLE="48.11 The index Database Program "><IMGSRC="gifs/txtpreva.gif"SRC="gifs/txtpreva.gif"ALT="Previous: 48.11 The index Database Program "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="CHAPTER"HREF="ch49_01.htm"TITLE="49. Working with Numbers"><IMGSRC="gifs/txtnexta.gif"SRC="gifs/txtnexta.gif"ALT="Next: 49. 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