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git-svn-id: svn+ssh://atelier.inf.usi.ch/home/bevilj/group-1@248 a672b425-5310-4d7a-af5c-997e18724b81

site/pages/cmd/advanced/head-tail.html

@@ -4,48 +4,39 @@ author: Agostino Monti
 category-page: advanced
 category-title: Advanced commands
 tags: head tail text file
-title: head-tail
+title: head and tail
 ---
 
-<br>
-<br>
- <h3><code>head</code></h3>
-   <p>The <code>head</code> command reads the first few lines of any text given to it as an input
-    and writes them to standard output.
-    If more than one input file is provided, head will return the first ten lines
-    from each file, precede each set of lines by the name of the file and separate
-    each set of lines by one vertical space. </p>
-    <br>
+The <code>head</code> command reads the first few lines of any text given to it as an input
+and writes them to standard output.<br>
+If more than one input file is provided, head will return the first ten lines
+from each file, precede each set of lines by the name of the file and separate
+each set of lines by one vertical space.
 
-  <h3><code>tail</code></h3>
-    <p>The tail command is similar to the head command
-      except that it reads the final lines in files rather than the first lines.</p>
+<pre>
+head [flags] [file1] [file2] ...
+</pre>
 
-    <h4>Examples</h4>
-    <p><pre>
-      head file1.txt <br>
-      head file1.txt file2.txt <br>
-      tail fail1.txt</pre></p>
+The <code>tail</code> command is similar to the <code>head</code> command
+except that it reads the final lines in files rather than the first lines.
 
+<pre>
+tail [flags] [file1] [file2] ...
+</pre>
 
-    <h3>flags</h3>
-    <ul>
-      <li>The <code>-n</code> option can be used followed by an integer indicating the number of lines desired.
-        -n is a very tolerant option, it is not necessary for the integer to directly
-        follow it without a space in between. In fact, the letter <i>n</i> does not
-        even need to be used at all. Just the hyphen and the integer
-        (with no intervening space) are sufficient to tell head how many lines to return.
-        <h4>Examples</h4>
-        <pre>
-        head -n15 file1.txt <br>
-        head -n   15 file1.txt <br>
-        head -15 file1.txt</pre></li>
+<h3>Flags</h3>
 
-      <li>The output from other commands can be sent via a pipe (represented by the vertical bar character)
-         to head to use as its input. The following sends the output from the ls command
-         to head, which, in turn, displays the first ten lines of the output that it receives from ls
-         <h4>Examples</h4>
-         <pre>
-         ls | head </pre></li>
-
-    </ul>
+<ul>
+    <li><b>-n</b>: can be used followed by number, which indicates the number of
+        lines desired in the output. This flag can be used without <i>n</i>: the hyphen and the
+        number (with no intervening space) are enough to tell head how many lines to return.
+<pre>
+head -n15 file1.txt <br>
+head -n 15 file1.txt <br>
+head -15 file1.txt</pre>
+    </li>
+    <li><b>-c</b>: similar to <i>-n</i> with the only difference being that the number stands for
+        bytes instead of the number of lines and the fact that it can't be used without explicitly
+        typing the <i>-c</i>.
+    </li>
+</ul>

site/pages/cmd/advanced/paste.html

@@ -0,0 +1,35 @@
+---
+layout: page
+author: Agostino Monti
+category-page: advanced
+category-title: Advanced commands
+tags: filie coluns analize
+title: paste
+---
+
+The <code>paste</code> command is used to join files horizontally
+(parallel merging) by outputting lines consisting of the sequentially corresponding
+lines of each file specified, separated by tabs, to the standard output.<br>
+Once involved, <code>paste</code> will read all its file arguments. For each corresponding line,
+paste will append the contents of each file at that line to its output along with a tab.
+When it has completed its operation for the last file, <code>paste</code> will output a newline
+character and move on to the next line.
+
+<pre>
+paste [flags] [file1] [file2] ...
+</pre>
+
+<h3>Flags</h3>
+
+<ul>
+    <li><code>-d</code> delimiters, which specifies a list of delimiters to be used instead of tabs
+        for separating consecutive values on a single line. Each delimiter is used in turn;
+        when the list has been exhausted, paste begins again at the first delimiter.
+<pre>
+paste -d "|" file1.txt file2.txt
+paste -d "|," file1.txt file2.txt</pre>
+    </li>
+    <li><code>-s</code>, which causes paste to append the data in serial rather than in parallel;
+        that is, in a horizontal rather than vertical fashion.
+    </li>
+</ul>