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<HTML><!--Distributed by F --><HEAD><TITLE>[Chapter 24] 24.13 Save Space in Executable Files with strip </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="1998-08-04T21:41:42Z"><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="ch24_01.htm"TITLE="24. Other Ways to Get Disk Space"><LINKREL="prev"HREF="ch24_12.htm"TITLE="24.12 Compressing a Directory Tree: Fine-Tuning "><LINKREL="next"HREF="ch24_14.htm"TITLE="24.14 Don't Use strip Carelessly "></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="ch24_12.htm"TITLE="24.12 Compressing a Directory Tree: Fine-Tuning "><IMGSRC="gifs/txtpreva.gif"SRC="gifs/txtpreva.gif"ALT="Previous: 24.12 Compressing a Directory Tree: Fine-Tuning "BORDER="0"></A></TD><TDALIGN="CENTER"VALIGN="TOP"WIDTH="171"><B><FONTFACE="ARIEL,HELVETICA,HELV,SANSERIF"SIZE="-1">Chapter 24<BR>Other Ways to Get Disk Space</FONT></B></TD><TDALIGN="RIGHT"VALIGN="TOP"WIDTH="172"><ACLASS="SECT1"HREF="ch24_14.htm"TITLE="24.14 Don't Use strip Carelessly "><IMGSRC="gifs/txtnexta.gif"SRC="gifs/txtnexta.gif"ALT="Next: 24.14 Don't Use strip Carelessly "BORDER="0"></A></TD></TR></TABLE> <HRALIGN="LEFT"WIDTH="515"TITLE="footer"></DIV><DIVCLASS="SECT1"><H2CLASS="sect1"><ACLASS="title"NAME="UPT-ART-5460">24.13 Save Space in Executable Files with strip </A></H2><TABLECLASS="para.programreference"BORDER="1"><TR><THVALIGN="TOP"><ACLASS="xref.warning"HREF="ch24_14.htm"TITLE="24.14 Don't Use strip Carelessly ">Warning!</A> </TH><TDVALIGN="TOP"> After you<SPANCLASS="link">compile (<ACLASS="linkend"HREF="ch52_08.htm"TITLE="Building Programs from Source Code ">52.8</A>)</SPAN><ACLASS="indexterm"NAME="AUTOID-26864"></A><ACLASS="indexterm"NAME="AUTOID-26867"></A><ACLASS="indexterm"NAME="AUTOID-26870"></A><ACLASS="indexterm"NAME="AUTOID-26874"></A><ACLASS="indexterm"NAME="AUTOID-26876"></A>and debug a program, there's a part of the executablebinary that you can delete to save disk space.The <EMCLASS="emphasis">strip</EM> command does the job.Note that once you strip a file, you can't use a symbolic debugger like<EMCLASS="emphasis">dbx</EM> on it!</TD></TR></TABLE><PCLASS="para">Here's an example.I'll compile a C program and list it.Then I'll strip it and list it again.How much space you save depends on several factors, but you'll almostalways save something.</P><PCLASS="para"><TABLECLASS="screen.co"BORDER="1"><TR><THVALIGN="TOP"><PRECLASS="calloutlist"> <ACLASS="co"HREF="ch17_14.htm"TITLE="17.14 Searching for Files by Size ">-s</A> </PRE></TH><TDVALIGN="TOP"><PRECLASS="screen">% <CODECLASS="userinput"><B>cc -o echoerr echoerr.c</B></CODE>% <CODECLASS="userinput"><B>ls -ls echoerr</B></CODE> 52 -rwxr-xr-x 1 jerry 24706 Nov 18 15:49 echoerr% <CODECLASS="userinput"><B>strip echoerr</B></CODE>% <CODECLASS="userinput"><B>ls -ls echoerr</B></CODE> 36 -rwxr-xr-x 1 jerry 16656 Nov 18 15:49 echoerr</PRE></TD></TR></TABLE></P><PCLASS="para">If you know that you want a file stripped when you compile it, use<EMCLASS="emphasis">cc</EM> with its <EMCLASS="emphasis">-s</EM> option.If you use <EMCLASS="emphasis">ld</EM>-say, in a<SPANCLASS="link"><EMCLASS="emphasis">makefile</EM> (<ACLASS="linkend"HREF="ch28_13.htm"TITLE="make Isn't Just for Programmers! ">28.13</A>)</SPAN>-use the <EMCLASS="emphasis">-s</EM> option there.</P><PCLASS="para"><ACLASS="indexterm"NAME="AUTOID-26897"></A>Here's a shell script named <EMCLASS="emphasis">stripper</EM> that finds all the unstrippedexecutable files in<SPANCLASS="link">your <EMCLASS="emphasis">bin</EM> directory (<ACLASS="linkend"HREF="ch04_02.htm"TITLE="A bin Directory for Your Programs and Scripts ">4.2</A>)</SPAN>and strips them.It's a quick way to save space on your account.(The same script, searching the whole filesystem, will save even more spacefor system administrators - but<SPANCLASS="link">watch out for unusual filenames (<ACLASS="linkend"HREF="ch09_22.htm"TITLE="xargs: Problems with Spaces and Newlines ">9.22</A>)</SPAN>):</P><PCLASS="para"><TABLECLASS="screen.co"BORDER="1"><TR><THVALIGN="TOP"><PRECLASS="calloutlist"> <ACLASS="co"HREF="ch09_21.htm"TITLE="9.21 Handle Too-Long Command Lines with xargs ">xargs</A> </PRE></TH><TDVALIGN="TOP"><PRECLASS="screen"> #! /bin/shskipug="! -perm -4000 ! -perm -2000" # SKIP SETUID, SETGID FILESfind $HOME/bin -type f \( -perm -0100 $skipug \) -print |xargs file |sed -n '/executable .*not stripped/s/:<KBDCLASS="keycap">[TAB]</KBD>.*//p' | xargs -t strip</PRE></TD></TR></TABLE></P><PCLASS="para">The<SPANCLASS="link"><EMCLASS="emphasis">find</EM> (<ACLASS="linkend"HREF="ch17_02.htm"TITLE="Delving Through a Deep Directory Tree ">17.2</A>)</SPAN>finds all executable files that<SPANCLASS="link">aren't setuid or setgid (<ACLASS="linkend"HREF="ch24_14.htm"TITLE="Don't Use strip Carelessly ">24.14</A>)</SPAN>and runs<SPANCLASS="link"><EMCLASS="emphasis">file</EM> (<ACLASS="linkend"HREF="ch25_08.htm"TITLE="Finding File Types ">25.8</A>)</SPAN>to get a description of each.The <EMCLASS="emphasis">sed</EM> command skips shell scripts and other files that can't bestripped.<EMCLASS="emphasis">sed</EM> searches for lines from <EMCLASS="emphasis">file</EM> like:</P><PCLASS="para"><BLOCKQUOTECLASS="screen"><PRECLASS="screen">/usr/local/bin/xemacs:<KBDCLASS="keycap">[TAB]</KBD><CODECLASS="replaceable"><I>xxx</I></CODE>... executable <CODECLASS="replaceable"><I>xxx</I></CODE>... not stripped</PRE></BLOCKQUOTE></P><PCLASS="para">with the word "executable" followed by "not stripped"-<EMCLASS="emphasis">sed</EM>removes the colon, tab, and description, then passes the filenameto <EMCLASS="emphasis">strip</EM>.</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="ch24_12.htm"TITLE="24.12 Compressing a Directory Tree: Fine-Tuning "><IMGSRC="gifs/txtpreva.gif"SRC="gifs/txtpreva.gif"ALT="Previous: 24.12 Compressing a Directory Tree: Fine-Tuning "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="ch24_14.htm"TITLE="24.14 Don't Use strip Carelessly "><IMGSRC="gifs/txtnexta.gif"SRC="gifs/txtnexta.gif"ALT="Next: 24.14 Don't Use strip Carelessly "BORDER="0"></A></TD></TR><TR><TDALIGN="LEFT"VALIGN="TOP"WIDTH="172">24.12 Compressing a Directory Tree: Fine-Tuning </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">24.14 Don't Use strip Carelessly </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
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