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<HTML><!--Distributed by F --><HEAD><TITLE>[Chapter 51] 51.11 Making an Arbitrary-Size File for Testing </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="1998-08-04T21:57:31Z"><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="ch51_01.htm"TITLE="51. Miscellaneous Useful Programs and Curiosities"><LINKREL="prev"HREF="ch51_10.htm"TITLE="51.10 The date Command "><LINKREL="next"HREF="ch51_12.htm"TITLE="51.12 You Don't Have Enough Smileys? 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"BORDER="0"></A></TD></TR></TABLE> <HRALIGN="LEFT"WIDTH="515"TITLE="footer"></DIV><DIVCLASS="SECT1"><H2CLASS="sect1"><ACLASS="title"NAME="UPT-ART-0469">51.11 Making an Arbitrary-Size File for Testing </A></H2><PCLASS="para"><ACLASS="indexterm"NAME="AUTOID-60469"></A><ACLASS="indexterm"NAME="AUTOID-60471"></A><ACLASS="indexterm"NAME="AUTOID-60473"></A>The<SPANCLASS="link"><EMCLASS="emphasis">yes</EM> command (<ACLASS="linkend"HREF="ch23_04.htm"TITLE='Answer "Yes" or "No" Forever with yes'>23.4</A>)</SPAN>outputs text over and over.If you need a file of some size for testing, make it with <EMCLASS="emphasis">yes</EM> and<SPANCLASS="link"><EMCLASS="emphasis">head</EM> (<ACLASS="linkend"HREF="ch25_20.htm"TITLE="Printing the Top of a File ">25.20</A>)</SPAN>.For example, to make a file 100k (102,400) characters long,with 12,800 8-character lines (7 digits and a newline), type:</P><PCLASS="para"><BLOCKQUOTECLASS="screen"><PRECLASS="screen">% <CODECLASS="userinput"><B>yes 1234567 | head -12800 > 100k-file</B></CODE></PRE></BLOCKQUOTE></P><BLOCKQUOTECLASS="note"><PCLASS="para"><STRONG>NOTE:</STRONG> On some UNIX systems, that command may "hang" and need to be killed withCTRL-c - because <EMCLASS="emphasis">head</EM> keeps reading input from the pipe.If it hangs on your system, replace <CODECLASS="literal">head -12800</CODE> with<CODECLASS="literal">sed 12800q</CODE>.</P></BLOCKQUOTE><DIVCLASS="sect1info"><PCLASS="SECT1INFO">- <SPANCLASS="authorinitials">JIK</SPAN>, <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="ch51_10.htm"TITLE="51.10 The date Command "><IMGSRC="gifs/txtpreva.gif"SRC="gifs/txtpreva.gif"ALT="Previous: 51.10 The date Command "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="ch51_12.htm"TITLE="51.12 You Don't Have Enough Smileys? 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