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linux1.html
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<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<meta name="keywords" content="MySQL" />
<title>Little Grass</title>
<meta http-equiv="content-type" content="text/html; charset=iso-8859-1" />
<!-- **** Layout Stylesheet **** -->
<link rel="stylesheet" type="text/css" href="type.css" charset="utf-8"/>
<link rel="shortcut icon" href="img/grass.jpg" />
</head>
<body>
<div id="container">
<!-- HEADER and MENU //-->
<div id="header">
<img src="/img/linux.jpg" class="fltright" height=100 alt="Linux"/>
<h1>Linux</h1>
<p>Linux Commands and Regular Expression</p>
</div>
<div id="menu">
<a href="share.html">Back</a>
</div>
<div id="contentwide">
Liunx is a very powerful operating system (OS). Many programming softwares are built on Linux.
<br>Learning Linux commands is the first step to get familiar with the OS.
<br>
<br>
<table border = "3" bordercolor="black">
<tr>
<td colspan="6"><center><h1>Linux Commands</h1></center></td>
</tr>
<tr align="center">
<td></td>
<td>Command</td>
<td>Meaning</td>
<td>Add-on Command</td>
<td>Add-on Meaning</td>
<td>Example</td>
</tr>
<tr>
<td rowspan =2>ssh</td>
<td>sz</td>
<td>download files from Linux to Host computer</td>
<td>-y</td>
<td>replace the overlaps </td>
</tr>
<tr>
<td>rz</td>
<td>upload files from Host computer to Linux</td>
</tr>
<tr>
<td rowspan =14>General</td>
<td>cd</td>
<td>Entry directory</td>
</tr>
<tr>
<td>ls</td>
<td>Show files in the directory </td>
</tr>
<tr>
<td>pwd</td>
<td>Show current directory</td>
</tr>
<tr>
<td>vi/vim</td>
<td>Edit</td>
</tr>
<tr>
<td>echo</td>
<td>Print output</td>
</tr>
<tr>
<td>cat</td>
<td>Print file</td>
<td></td>
<td></td>
<td>cat -n /etc/service|tail -1</td>
</tr>
<tr>
<td>cp</td>
<td>Copy</td>
</tr>
<tr>
<td>rm</td>
<td>Remove</td>
<td>-f</td>
<td>enforce delete</td>
</tr>
<tr>
<td>mv</td>
<td>Move a file or change filename</td>
</tr>
<tr>
<td>mkdir</td>
<td>Make a directory </td>
</tr>
<tr>
<td>touch</td>
<td>Create a document </td>
</tr>
<tr>
<td>head</td>
<td>Show head of output</td>
<td>-10</td>
<td>First 10 letter</td>
</tr>
<tr>
<td>tail</td>
<td>Show head of output</td>
<td>-10</td>
<td>Last 10 letter</td>
</tr>
<tr>
<td>cp</td>
<td>Copy</td>
</tr>
<tr>
<td rowspan =3>Filter</td>
<td>grep</td>
<td>Commonly use</td>
<td>-v</td>
</tr>
<tr>
<td>sed</td>
<td>Better for rows</td>
</tr>
<tr>
<td>awk</td>
<td>Better for column</td>
<td></td><td></td>
<td>awk '{if(NR>10&&NR<40) print$0}' ett.txt</td>
</tr>
<tr>
<td rowspan =4>Search</td>
<td>find</td>
<td>Search for content</td>
<td>-type; -name; -mtime</td><td></td><td>find / -type (f d) -name "" -mtime -10</td>
</tr>
<tr>
<td>locate</td>
<td>= find -name</td>
<td></td><td></td><td>locate /etc/sh</td>
</tr>
<tr>
<td>whereis</td>
<td>Only search for programs</td>
<td></td><td></td><td>whereis grep</td>
</tr>
<tr>
<td>which</td>
<td>Search for command path</td>
<td></td><td></td><td>which grep</td>
</tr>
<tr>
<td rowspan =2>Install</td>
<td>yum</td>
<td>Commonly use</td>
<td>install</td>
<td></td></td><td>yum install lrzsz -y</td>
</tr>
<tr>
<td>yum</td>
<td>Commonly use</td>
<td>groupinstall</td>
<td></td></td><td>yum groupinstall "Dial-up Networking Support" -y</td>
</tr>
<tr>
<td rowspan =9>Potential</td>
<td>alias</td>
<td>Give command an alias</td>
</tr>
<tr>
<td>unalise</td>
<td>Disabled alias</td>
</tr>
<tr>
<td>tree</td>
<td>View the directory structure</td>
</tr>
<tr>
<td>xargs</td>
<td>After |</td>
</tr>
<tr>
<td>seq</td>
<td>sequence</td>
</tr>
<tr>
<td>man</td>
<td>View command help</td>
</tr>
<tr>
<td>history</td>
<td>View history code</td>
</tr>
<tr>
<td>cut</td>
<td>Cut the required content</td>
<td>-c; -d; -f</td>
<td>character; break; field</td>
<td>cut -c 8-14,21- test.txt; cut -d" " -f4,7 test.txt</td>
</tr>
<tr>
<td>wc</td>
<td>Count</td>
<td>-l</td>
<td>lines</td>
</tr>
<td rowspan =4>Tab</td>
<td>Ctrl+C</td>
<td>Terminate current task</td>
</tr>
<tr>
<td>Ctrl+d</td>
<td>Logoff</td>
</tr>
<tr>
<td>Ctrl+Shift+C</td>
<td>Copy(used in SecureCRT)</td>
</tr>
<tr>
<td>Ctrl+a</td>
<td>Back to top</td>
</tr>
</table>
<br>
<br>Regular Expression is a very convenient and commonly used programming language.
<br><br><table border = "3" bordercolor="black">
<tr>
<td colspan="6"><center><h1>Regular Expression</h1></center></td>
</tr>
<tr align="center">
<td></td>
<td>Letter</td>
<td>Meaning</td>
<td>Example</td>
</tr>
<tr>
<td rowspan =10>Basic</td>
<td>^#</td>
<td>Begin with #</td>
<td>^word</td>
</tr>
<tr>
<td>#$</td>
<td>End with #</td>
<td>word$</td>
</tr>
<tr>
<td>.</td>
<td>one letter</td>
</tr>
<tr>
<td>\</td>
<td>transition symbols </td>
</tr>
<tr>
<td>*</td>
<td>repeat 0 or many letters</td>
</tr>
<tr>
<td>[]</td>
<td>character set</td>
</tr>
<tr>
<td>[^#]</td>
<td>No #</td>
<td>[^word]</td>
</tr>
<tr>
<td>{n,m}</td>
<td>repeat n to m times</td>
<td>word{n,m}</td>
</tr>
<tr>
<td>{n,}</td>
<td>At least n times</td>
<td>word{n,}</td>
</tr>
<tr>
<td>{n}]</td>
<td>n times</td>
<td>word{n}</td>
</tr>
<tr>
<td rowspan =4>Expand</td>
<td>+</td>
<td>repeat 1 or more letters</td>
</tr>
<tr>
<td>?</td>
<td>repeat 0 or 1 letter</td>
</tr>
<tr>
<td>|</td>
<td>= or</td>
</tr>
<tr>
<td>()</td>
<td>character string</td>
</tr>
</table>
<a href="#container">
<img border="0" alt="Back To Top" src="img/rocket.jpg" height="50" class="fltright">
</a>
<div id="footer">
<p>Copyright 2017 Siyuan Cao</p>
</div>
</div>
</body>
</html>