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file_merge.html
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<html>
<head>
<title>
FILE_MERGE - Merge Two Sorted Files
</title>
</head>
<body bgcolor="#EEEEEE" link="#CC0000" alink="#FF3300" vlink="#000055">
<h1 align = "center">
FILE_MERGE <br> Merge Two Sorted Files
</h1>
<hr>
<p>
<b>FILE_MERGE</b>
is a FORTRAN90 program which
merges two sorted files.
</p>
<p>
Note that on Unix systems, the command <b>merge</b> is faster,
more flexible and efficient.
</p>
<h3 align = "center">
Usage:
</h3>
<p>
<b>file_merge</b> <i>input1</i> <i>input2</i> <i>output</i>
</p>
<h3 align = "center">
Licensing:
</h3>
<p>
The computer code and data files described and made available on this web page
are distributed under
<a href = "../../txt/gnu_lgpl.txt">the GNU LGPL license.</a>
</p>
<h3 align = "center">
Related Data and Programs:
</h3>
<p>
<a href = "../../f_src/chrpak/chrpak.html">
CHRPAK</a>,
a FORTRAN90 library which
can work with characters and strings.
</p>
<p>
<a href = "../../f_src/file_row_reverse/file_row_reverse.html">
FILE_ROW_REVERSE</a>,
a FORTRAN90 program which
makes a copy of a file with the lines ("rows") in reverse order.
</p>
<p>
<a href = "../../f_src/file_transpose/file_transpose.html">
FILE_TRANSPOSE</a>,
a FORTRAN90 program which
makes a "transposed" copy of a file, in which the I-th "word" of the J-th line
becomes the J-th word of the I-th line.
</p>
<p>
<a href = "../../f_src/filum/filum.html">
FILUM</a>,
a FORTRAN90 library which
can work with information in text files.
</p>
<h3 align = "center">
Source Code:
</h3>
<p>
<ul>
<li>
<a href = "file_merge.f90">file_merge.f90</a> the source code.
</li>
<li>
<a href = "file_merge.sh">file_merge.sh</a>,
commands to compile the source code;
</li>
</ul>
</p>
<h3 align = "center">
Examples and Tests:
</h3>
<p>
<ul>
<li>
<a href = "file1.txt">file1.txt</a>,
a file of 26 lines, sorted alphabetically.
</li>
<li>
<a href = "file2.txt">file2.txt</a>,
a file of 19 lines, sorted alphabetically, with 5 words that duplicate
words in the first file.
</li>
<li>
<a href = "file3.txt">file3.txt</a>,
a file of 40 lines, sorted alphabetically, created by the command
<blockquote><b>
file_merge file1.txt file2.txt file3.txt
</b></blockquote>
</li>
</ul>
</p>
<h3 align = "center">
List of Routines:
</h3>
<p>
<ul>
<li>
<b>MAIN</b> is the main program for FILE_MERGE.
</li>
<li>
<b>CH_LOW</b> lowercases a single character.
</li>
<li>
<b>GET_UNIT</b> returns a free FORTRAN unit number.
</li>
<li>
<b>MERGE_SORTED_FILES</b> merges two sorted files into a third.
</li>
<li>
<b>S_LOW</b> replaces all uppercase letters by lowercase ones.
</li>
<li>
<b>TIMESTAMP</b> prints the current YMDHMS date as a time stamp.
</li>
</ul>
</p>
<p>
You can go up one level to <a href = "../f_src.html">
the FORTRAN90 source codes</a>.
</p>
<hr>
<i>
Last revised on 22 April 2008.
</i>
<!-- John Burkardt -->
</body>
</html>