advanced:paste-cat

git-svn-id: svn+ssh://atelier.inf.usi.ch/home/bevilj/group-1@247 a672b425-5310-4d7a-af5c-997e18724b81

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

@@ -0,0 +1,51 @@
+---
+layout: page
+author: Agostino Monti
+category-page: advanced
+category-title: Advanced commands
+tags: head tail text file
+title: head-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>
+
+  <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>
+
+    <h4>Examples</h4>
+    <p><pre>
+      head file1.txt <br>
+      head file1.txt file2.txt <br>
+      tail fail1.txt</pre></p>
+
+
+    <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>
+
+      <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>

site/pages/cmd/advanced/paste-cat.html

@@ -0,0 +1,58 @@
+---
+layout: page
+author: Agostino Monti
+category-page: advanced
+category-title: Advanced commands
+tags: filie coluns analize
+title: paste
+---
+
+<br>
+<br>
+<p><code>paste</code> is a Unix command line utility which 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.
+  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.</p>
+
+<h3><code>cat</code></h3>
+<p><code>cat</code> is a standard Unix utility that reads files sequentially, writing them to standard output.
+  The name is derived from its function to con<code>cat</code>enate files.</p>
+
+  <h4>Examples</h4>
+  <p><pre>
+    paste file1.txt file2.txt <br>
+    cat fail1.txt fail2.txt</pre></p>
+
+    <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.
+        <h4>Examples</h4>
+        <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.
+        <h4>Examples</h4>
+        <pre>
+        paste -s file1.txt file2.txt</pre></li>
+
+      <li><code>-u</code> is one option flag, <code>-u</code> for unbuffered output,
+        meaning that each byte is written after it has been read.
+        <h4>Examples</h4>
+        <pre>
+        cat -u file1.txt file2.txt</pre></li>
+
+      <li><code>-n</code> this option numbers all output lines
+        <h4>Examples</h4>
+        <pre>
+        cat -n file1.txt
+        cat -n file1.txt file2.txt</pre></li>
+
+
+    </ul>