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    <p>php file contains your example text:</p> <pre><code>kent$ awk '/login/{l++;if(l&gt;1)gsub(/root/,"newLogin");} /password/{p++;if(p&gt;1)gsub(/xxx/,"newPwd");} /database/{d++;if(d&gt;1)gsub(/xxx/,"newDB");} 1' php &lt;?php class DATABASE_CONFIG { public $default = array( 'datasource' =&gt; 'Database/Mysql', 'persistent' =&gt; false, 'host' =&gt; 'localhost', 'login' =&gt; 'root', 'password' =&gt; 'xxx', 'database' =&gt; 'xxx', 'prefix' =&gt; '', //'encoding' =&gt; 'utf8', ); public $test = array( 'datasource' =&gt; 'Database/Mysql', 'persistent' =&gt; false, 'host' =&gt; 'localhost', 'login' =&gt; 'newLogin', 'password' =&gt; 'newPwd', 'database' =&gt; 'cake_test_db', 'prefix' =&gt; '', //'encoding' =&gt; 'utf8', ); } </code></pre> <p>this only changes the blocks after your $default block. and, <strong>only</strong> default value will be changed. e.g. in your $test, <code>'database' =&gt; 'cake_test_db'</code> the value is not the default 'xxx', so it would not be changed.</p> <p>if you like you can put new value in variable, and passing to awk with -v.</p> <p><strong>edit</strong></p> <p>if you want to change all values, (including $default block), it would be easier, check the lines below: (same as above, only defalut values (root, xxx,xxx) would be changed.</p> <pre><code>kent$ awk '/login/{gsub(/root/,"newLogin");} /password/{gsub(/xxx/,"newPwd");} /database/{gsub(/xxx/,"newDB");} 1' php &lt;?php class DATABASE_CONFIG { public $default = array( 'datasource' =&gt; 'Database/Mysql', 'persistent' =&gt; false, 'host' =&gt; 'localhost', 'login' =&gt; 'newLogin', 'password' =&gt; 'newPwd', 'database' =&gt; 'newDB', 'prefix' =&gt; '', //'encoding' =&gt; 'utf8', ); public $test = array( 'datasource' =&gt; 'Database/Mysql', 'persistent' =&gt; false, 'host' =&gt; 'localhost', 'login' =&gt; 'newLogin', 'password' =&gt; 'newPwd', 'database' =&gt; 'cake_test_db', 'prefix' =&gt; '', //'encoding' =&gt; 'utf8', ); } </code></pre> <p><strong>edit2</strong></p> <p>this works for your new example in question.</p> <pre><code> sed '/login/{s/username/newLOGIN/}; /password/{s/password/newPWD/2}; /database/{s/database_name/newDB/}' php &lt;?php class DATABASE_CONFIG { public $default = array( 'datasource' =&gt; 'Database/Mysql', 'persistent' =&gt; false, 'host' =&gt; 'hostname', 'login' =&gt; 'newLOGIN', 'password' =&gt; 'newPWD', 'database' =&gt; 'newDB', 'prefix' =&gt; '', //'encoding' =&gt; 'utf8', ); public $test = array( 'datasource' =&gt; 'Database/Mysql', 'persistent' =&gt; false, 'host' =&gt; 'hostname', 'login' =&gt; 'newLOGIN', 'password' =&gt; 'newPWD', 'database' =&gt; 'newDB', 'prefix' =&gt; '', //'encoding' =&gt; 'utf8', ); } </code></pre>
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    1. COIt's only changing the $test block, not the $default .
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    2. COcheck the updated answer.
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