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 100                                 <h1>Using arrays in bash</h1>
 101                                 <p class="byline">by <a href="http://search.techrepublic.com.com/search/Vincent Danen.html">Vincent Danen</a>&nbsp;|&nbsp;Aug 08, 2005 7:00:00 AM</p>
 102
 103                                                         <p class="tags"><b>Tags:</b>                                                                            <a href="http://search.techrepublic.com.com/search/Linux.html">Linux</a>,                                                                               <a href="http://search.techrepublic.com.com/search/Vincent Danen.html">Vincent Danen</a>,                                                                               <a href="http://search.techrepublic.com.com/search/Foo.html">Foo</a>,                                                                           <a href="http://search.techrepublic.com.com/search/Linux Tips Newsletter.html">Linux Tips Newsletter</a>                                                                        </p>
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 237                                 <p class="takeaway"><b>Takeaway:</b> Learn two ways two declare an array in bash in this Linux tip.</p>
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 248                                 <p>Assigning variables in bash is easily done and extremely
 249 useful, but like other programming languages, bash can also use arrays. This is
 250 particularly handy when you want to read the contents of a file into an array or
 251 simply keep your scripts more organized and logical.</p>
 252
 253 <p>There are two ways of declaring an array:</p>
 254
 255 <pre>&lt;code&gt;<br>declare -a FOO<br>&lt;/code&gt;</pre>
 256
 257 <p>This creates an empty array called FOO. You can also declare
 258 an array by assigning values to it:</p>
 259
 260 <pre>&lt;code&gt;<br>FOO[2] = 'bar'<br>&lt;/codE&gt;</pre>
 261
 262 <p>This assigns the third element of the array to the value
 263 'bar'. In this instance, FOO[0] and FOO[1] are also
 264 created, but their values are empty.</p>
 265
 266 <p>To populate an array, use:</p>
 267
 268 <pre>&lt;code&gt;<br>FOO=( bar string 'some text' )<br>&lt;/code&gt;</pre>
 269
 270 <p>This assigns the first element (FOO[0])
 271 to 'bar', the second (FOO[1]) to 'string' and the final element (FOO[3]) to
 272 'some text'. Notice that the array elements are separated by a blank space, so
 273 if a value contains white spaces it must be quoted.</p>
 274
 275 <p>To use an array, it is referred to as $FOO[2]
 276 but it also needs to be surrounded in curly braces, otherwise bash will not
 277 expand it correctly:</p>
 278
 279 <pre>&lt;code&gt;<br>$ echo {$FOO[2]}<br>some text<br>&lt;/code&gt;</pre>
 280
 281 <p>To loop through an array, you can use a piece of shell code
 282 like the following:</p>
 283
 284 <pre>&lt;code&gt;<br>
 285 #!/bin/sh</pre><pre>FOO=( bar string 'some text')<br>foonum=${#FOO}<br>
 286 for ((i=0;i&lt;$foonum;i++)); do<br>   echo ${FOO[${i}]}</pre><pre>done<br>&lt;/code&gt;</pre>
 287
 288 <p>Here we loop through each item of the array and print out its
 289 value. Each array element is accessed by number, so we use the special variable
 290 ${#FOO} which gives the number of elements in the array (in the above case, it
 291 would return the number 3). That value is then used in the <i>for</i> loop to determine how many
 292 times to loop. By accessing the array in this manner, you can easily generate
 293 arrays from external data or command-line arguments, and process each element
 294 one at a time.</p>
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 545                         <th>Posted</th>
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 549                         <td><a href="http://dw.com.com/redir?siteid=11&tag=pos1&desturl=http://techrepublic.simplyhired.com/a/jobs/view/jobkey-366a25ebc777d8842a6d72de52dfa14cc53d82/hits-20295&part=simplyhired.com&subj=Help+Desk+Support">Help Desk Support</a>Lake Forest, CA</td>
 550                         <td>01/08/2008</td>
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 556                         <td>01/02/2008</td>
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 562                         <td>01/11/2008</td>
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 568                         <td>11/07/2007</td>
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 593 <li><a target="_top" href="http://dw.com.com/rubicsclk?ver=2&ts=2008.01.13.18.23.45&edId=87&onId=10878&ptId=2415&sId=11&appId=4&offId=1650&unitId=10&poolId=3&f1=11&f2=%2d0&f3=%2d0&alg=3&&opt=1&linkPos=1&destUrl=http%3A%2F%2Fwhitepapers.techrepublic.com.com%2Fabstract.aspx%3Fdocid%3D102740%26promo%3D100503">VoIP: A Big Success for Mainstream Manufacturer</a>  <cite>ShoreTel</cite></li>
 594 <li><a target="_top" href="http://dw.com.com/rubicsclk?ver=2&ts=2008.01.13.18.23.45&edId=87&onId=10878&ptId=2415&sId=11&appId=4&offId=1648&unitId=10&poolId=3&f1=11&f2=%2d0&f3=%2d0&alg=3&&opt=1&linkPos=2&destUrl=http%3A%2F%2Fwhitepapers.techrepublic.com.com%2Fabstract.aspx%3Fdocid%3D102793%26promo%3D100503">Voice over IP Manageability: Architecture Matters</a>  <cite>ShoreTel</cite></li>
 595 <li><a target="_top" href="http://dw.com.com/rubicsclk?ver=2&ts=2008.01.13.18.23.45&edId=87&onId=10878&ptId=2415&sId=11&appId=4&offId=92&unitId=10&poolId=3&f1=11&f2=%2d0&f3=%2d0&alg=3&&opt=1&linkPos=3&destUrl=http%3A%2F%2Fwhitepapers.techrepublic.com.com%2Fabstract.aspx%3Fdocid%3D149044%26promo%3D100503">InfoTech Report - Strategies for IP Telephony Evaluation and Migration</a>  <cite>ShoreTel</cite></li>
 596 <li><a target="_top" href="http://dw.com.com/rubicsclk?ver=2&ts=2008.01.13.18.23.45&edId=87&onId=10878&ptId=2415&sId=11&appId=4&offId=952&unitId=10&poolId=3&f1=11&f2=%2d0&f3=%2d0&alg=3&&opt=1&linkPos=4&destUrl=http%3A%2F%2Fwhitepapers.techrepublic.com.com%2Fabstract.aspx%3Fdocid%3D176363%26promo%3D100503">VoIP: Enhancing Customer Responsiveness and Employee Productivity at NORPAC Foods</a>  <cite>ShoreTel</cite></li>
 597 <li><a target="_top" href="http://dw.com.com/rubicsclk?ver=2&ts=2008.01.13.18.23.45&edId=87&onId=10878&ptId=2415&sId=11&appId=4&offId=1675&unitId=10&poolId=3&f1=11&f2=%2d0&f3=%2d0&alg=3&&opt=1&linkPos=5&destUrl=http%3A%2F%2Fwhitepapers.techrepublic.com.com%2Fabstract.aspx%3Fdocid%3D269636%26promo%3D100503">The Education Sector Rates Importance of IP Telephony Features, Management and Applications</a>  <cite>ShoreTel</cite></li>
 598 <li><a target="_top" href="http://dw.com.com/rubicsclk?ver=2&ts=2008.01.13.18.23.45&edId=87&onId=10878&ptId=2415&sId=11&appId=4&offId=870&unitId=10&poolId=3&f1=11&f2=%2d0&f3=%2d0&alg=3&&opt=1&linkPos=6&destUrl=http%3A%2F%2Fwhitepapers.techrepublic.com.com%2Fabstract.aspx%3Fdocid%3D170126%26promo%3D100503">Keeping Pace with Expansion through Voice Services</a>  <cite>ShoreTel</cite></li>
 599 <img src='http://dw.com.com/rubicsimp/c.gif?ver=2&ts=2008.01.13.18.23.45&edId=87&onId=10878&ptId=2415&sId=11&appId=4&unitId=10&poolId=3&f1=11&f2=%2d0&f3=%2d0&alg=3&opt=1&off=1650,-1;1648,-1;92,-1;952,-1;1675,-1;870,-1' height='1' width='1' alt=''/>
 600 </ul>
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 667                 <a href="http://adlog.com.com/adlog/c/r=9108&s=774121&o=1035:&h=cn&p=2&b=9&l=en_US&site=11&pt=5100&nd=1035&pid=&cid=5820685&pp=100&e=87&rqid=01c17-ad-e9476E46E712285E10&orh=www.google.com&oepartner=&epartner=&cpnmodule=&count=&ra=213.220.241.158&t=2008.01.14.02.23.42/http://dw.com.com/redir?tag=hs.bestbuy.ppthreats&destUrl=http://news.zdnet.com/2422-13569_22-176090.html"><img width="97" height="72" alt="Getting Hooked" src="http://i.i.com.com/cnwk.1d/Ads/1451/12/176091-96-72.jpg"/></a>
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 672 Agent Peterson of the Geek Squad offers some tips on how to protect yourself from viruses and spyware.
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 676 Photos: Ten views of Leopard
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