more.html

unix 下的C开发手册,还用详细的例程。

</pre>
<p>
Return to the position that
was previously marked with the letter named by
<i>letter</i>,
making that line the current position.
<h5><a name = "tag_001_014_1472_015">&nbsp;</a>Return to Previous Position</h5>
<pre>
<code>
<i>Synopsis</i>:   &quot;
</code>
</pre>
<p>
Return to the position from which the last large movement command was
executed (where a &quot;large movement&quot;
is defined as any movement of more than
a screenful of lines).
If no such movements have been made, return to
the beginning of the file.
<h5><a name = "tag_001_014_1472_016">&nbsp;</a>Search Forward for Pattern</h5>
<p><code>
<i>Synopsis</i>:   
<b>[</b><i>count</i><b>]</b>/<b>[</b>!<b>]</b><i>pattern</i>&lt;newline&gt;
</code>
<p>
Search forward in the file for the
<i>count</i>th
line containing the
<i>pattern</i>.
The
<i>count</i>
defaults to 1.
The search will start at
the line following the current position.
If the search is successful, the screen will be modified so that the
searched-for line is
in the current position.
The null regular expression
(/
followed by a
newline character)
will repeat the search using the previous regular expression.
If the character
"!"
is included, the lines for searching will be those
that do not contain the
<i>pattern</i>.
<p>
If a match is found for the
<i>pattern</i>,
the logical line containing the pattern will be written in the
current position.
If the matching line is
already on the screen, the screen will be scrolled to
make that line the current position;
otherwise, a full screen will be written.
If no match is found for the
pattern, a message to that effect will be written as a
part of the prompt, and the screen and the current position
will remain unchanged.
However, if no match is found and
the input is the standard input, the screen may be scrolled
to the last screenful of the input.
<h5><a name = "tag_001_014_1472_017">&nbsp;</a>Search Backward for Pattern</h5>
<p><code>
<i>Synopsis</i>:   
<b>[</b><i>count</i><b>]</b>?<b>[</b>!<b>]</b><i>pattern</i>&lt;newline&gt;
</code>
<p>
Search backward in the file for the
<i>count</i>th
line containing the
<i>pattern</i>.
The search will start at the line immediately before the
current position.
If the search is successful, the screen will be modified so that the
searched-for line is in the current position.
The null regular expression
(?
followed by a
newline character)
will repeat the search using the previous regular expression.
If the character
"!"
is included, the lines for searching will be those
that do not contain the
<i>pattern</i>.
<p>
If a match is found for the
<i>pattern</i>,
the logical line containing
the pattern will be written in
the current position.
If the matching line is
already on the screen, the screen will be scrolled to
make that line the current position;
otherwise, a full screen will be written.
If no match is found for the
pattern, a message to that effect will be written as a
part of the prompt, and the screen and the current position
will remain unchanged.
However, if no match is found and
the input is the standard input, the screen may be scrolled
to the last screenful of the input.
<h5><a name = "tag_001_014_1472_018">&nbsp;</a>Repeat Search</h5>
<p><code>
<i>Synopsis</i>:   
<b>[</b><i>count</i><b>]</b>n
</code>
<p>
Repeat the previous search for
<i>count</i>th
line (default 1) containing the last
<i>pattern</i>
(or not containing the last
<i>pattern</i>,
if the previous search
was
/!
or
?!).
<h5><a name = "tag_001_014_1472_019">&nbsp;</a>Repeat Search in Reverse</h5>
<p><code>
<i>Synopsis</i>:   
<b>[</b><i>count</i><b>]</b>N
</code>
<p>
Repeat the search in the opposite direction of the previous search for the
<i>count</i>th
line (default 1) containing the last
<i>pattern</i>
(or not containing the last
<i>pattern</i>,
if the previous search
was
/!
or
?!).
<h5><a name = "tag_001_014_1472_020">&nbsp;</a>Examine New File</h5>
<p><code>
<i>Synopsis</i>:   
:e <b>[</b><i>filename</i><b>]</b>&lt;newline&gt;
</code>
<p>
Examine a new file.
If the
<i>filename</i>
argument is not specified, the current file (see the
<b>:n</b>
and
<b>:p</b>
commands
below) from the list of files in the command line will be reexamined.
The
<i>filename</i>
will be subjected to the process of shell
word expansions (see
<xref href=wordexp><a href="chap2.html#tag_001_006">
Word Expansions
</a></xref>);
if more than a single pathname results, the
effects are unspecified.
If
<i>filename</i>
is a number sign
(#),
the previously examined file
will be reexamined.
If
<i>filename</i>
refers to a non-seekable file,
the results are unspecified.
<h5><a name = "tag_001_014_1472_021">&nbsp;</a>Examine Next File</h5>
<p><code>
<i>Synopsis</i>:   
<b>[</b><i>count</i><b>]</b>:n
</code>
<p>
Examine the next file.
If a number
<i>count</i>
is specified,
the
<i>count</i>th
next file will be examined.
If
<i>filename</i>
refers to a non-seekable file,
the results are unspecified.
<h5><a name = "tag_001_014_1472_022">&nbsp;</a>Examine Previous File</h5>
<p><code>
<i>Synopsis</i>:   
<b>[</b><i>count</i><b>]</b>:p
</code>
<p>
Examine the previous file.
If a number
<i>count</i>
is specified, the
<i>count</i>th
previous file will be examined.
If
<i>filename</i>
refers to
a non-seekable file,
the results are unspecified.
<h5><a name = "tag_001_014_1472_023">&nbsp;</a>Go to Tag</h5>
<p><code>
<i>Synopsis</i>:   :t <i>tagstring</i>&lt;newline&gt;
</code>
<p>
Go to the supplied
<i>tagstring</i>
and scroll/rewrite the screen
with that line in the current position;
see the
<b>-t</b>
option.
If the
<i><a href="ctags.html">ctags</a></i>
utility is not supported by the system, the use of
:t
produces undefined results.
<h5><a name = "tag_001_014_1472_024">&nbsp;</a>Invoke Editor</h5>
<pre>
<code>
<i>Synopsis</i>:   v
</code>
</pre>
<p>
Invoke an editor to edit the current file being examined.
If standard input is being examined,
the results are unspecified.
The name of the editor will be taken from the environment variable
<i>EDITOR ,
</i>or defaults to
<i><a href="vi.html">vi</a></i>.
If
<i>EDITOR</i>
represents either
<i><a href="vi.html">vi</a></i>
or
<i><a href="ex.html">ex</a></i>,
the editor will be invoked
with options such that the current editor line is the physical line
corresponding to the current position in
<i>more</i>
at the time of invocation.
For example, either
<i><a href="ex.html">ex</a></i>
or
<i><a href="vi.html">vi</a></i>
is invoked by specifying
the editor name and following that with
<b>-c</b>&nbsp;<i>linenumber</i>.
It is implementation-dependent whether line-setting
options are passed to editors other than
<i><a href="vi.html">vi</a></i>
and
<i><a href="ex.html">ex</a></i>.
<p>
The file types that can be edited are implementation-dependent.
<p>
When the editor exits,
<i>more</i>
will resume on the current file
by rewriting the screen with the current line
as the current position.
<h5><a name = "tag_001_014_1472_025">&nbsp;</a>Display Position</h5>
<pre>
<code>
<i>Synopsis</i>:   =
<i>Synopsis</i>:   &lt;control&gt;-G
</code>
</pre>
<p>
Write the name of the file currently being examined,
the number
relative to the total number of files there are to examine, the current
line number, the current byte number and the total bytes to write and
what percentage of the file
precedes the current position.
If
<i>more</i>
is reading from standard input,
or the file is shorter than a single screen, some
of these items need not be written.
All of these items will reference
the first byte of the line after the last line written.
<h5><a name = "tag_001_014_1472_026">&nbsp;</a>Quit</h5>
<pre>
<code>
<i>Synopsis</i>:   q
<i>Synopsis</i>:   :q
<i>Synopsis</i>:   ZZ
</code>
</pre>
<p>
Exit
<i>more</i>.
</blockquote><h4><a name = "tag_001_014_1473">&nbsp;</a>EXIT STATUS</h4><blockquote>
The following exit values are returned:
<dl compact>

<dt>0<dd>Successful completion.

<dt>&gt;0<dd>An error occurred.

</dl>
</blockquote><h4><a name = "tag_001_014_1474">&nbsp;</a>CONSEQUENCES OF ERRORS</h4><blockquote>
If an error is encountered accessing a file when using the
<b>:n</b>
command,
<i>more</i>
will attempt to examine the next file in the argument list,
but the final exit status will be affected.
If an error is encountered accessing a file via the
<b>:p</b>
command,
<i>more</i>
will attempt to examine the previous
file in the argument list, but the final exit status will be affected.
If an error is encountered accessing a file via the
<b>:e</b>
command,
<i>more</i>
will remain in the current file and the final exit status will not
be affected.
</blockquote><h4><a name = "tag_001_014_1475">&nbsp;</a>APPLICATION USAGE</h4><blockquote>
The operating mode referred to for block-mode terminals
effectively adds a newline character
to each synopsis line that currently has none.
So, for example,
<b>d</b>&lt;newline&gt;
would page one screenful.
The mode could be triggered by a command-line option,
environment variable or some other method.
<p>
When the standard output is not a terminal, none of
the filter-modification options are effective.
This is based on historical practice.
For example, a typical implementation of
<i><a href="man.html">man</a></i>
pipes its output through
<i>more</i>
<b>-s</b>
to squeeze excess white space for terminal users.
When
<i><a href="man.html">man</a></i>
is piped to
<i><a href="lp.html">lp</a></i>,
however, it is undesirable for this squeezing to happen.
</blockquote><h4><a name = "tag_001_014_1476">&nbsp;</a>EXAMPLES</h4><blockquote>
The
<b>-p</b>
allows arbitrary commands to be executed at the
start of each file.
Examples are:
<dl compact>

<dt><i>more&nbsp;</i>-p&nbsp;G&nbsp;<i>file1&nbsp;file2</i><dd>
Examine each file starting with its last screenful.

<dt><i>more&nbsp;</i>-p&nbsp;100&nbsp;<i>file1&nbsp;file2</i><dd>
Examine each file starting with line 100 in the current position
(usually the third line, so line 98 would be the first
line written).

<dt><i>more&nbsp;</i>-p&nbsp;/100&nbsp;<i>file1&nbsp;file2</i><dd>
Examine each file starting with the first line
containing the string
100
in the current position

</dl>
</blockquote><h4><a name = "tag_001_014_1477">&nbsp;</a>FUTURE DIRECTIONS</h4><blockquote>
The IEEE PASC 1003.2 Interpretations Committee has forwarded concerns about
parts of this interface definition to the IEEE PASC 1003.2 Interpretations Committee
which is identifying the corrections.
A future revision of this specification will align with
IEEE Std. 1003.2b when finalised.
</blockquote><h4><a name = "tag_001_014_1478">&nbsp;</a>SEE ALSO</h4><blockquote>
None.
</blockquote><hr size=2 noshade>
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Copyright &copy; 1997 The Open Group
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