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Top Forums Programming Need to modify contents of file with complex patterns. Post 302434748 by success on Monday 5th of July 2010 04:02:12 AM
Old 07-05-2010
Need to modify contents of file with complex patterns.

hi,
my fstab file content is like this along with some other lines:

Code:
/dev/vg0/var1  /var1  ext3  defaults  0  2
/dev/vg0/flx1  /flx1  ext3  defaults  0  2
/dev/vg0/var  /var  ext3  defaults  0  1
/dev/vg0/flx  /flx  ext3  defaults  0  2

I want to remove lines with /dev/vg0/var and /dev/vg0/flx ,

and modify the lines with
Code:
 "/dev/vg0/var1  /var1  ext3  defaults  0  2"

to
Code:
"/dev/vg0/var1  /var  ext3  defaults  0  2"

and

Code:
"/dev/vg0/flx1  /flx1  ext3  defaults  0  2"

to
Code:
"/dev/vg0/flx1  /flx  ext3  defaults  0  2"

I tried some options with sed but didn't work. Please help me in solving this in PERL.

Last edited by Scott; 07-05-2010 at 08:52 AM.. Reason: Code tags, please...
 

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VAR_EXPORT(3)								 1							     VAR_EXPORT(3)

var_export - Outputs or returns a parsable string representation of a variable

SYNOPSIS
mixed var_export (mixed $expression, [bool $return = false]) DESCRIPTION
var_export(3) gets structured information about the given variable. It is similar to var_dump(3) with one exception: the returned represen- tation is valid PHP code. PARAMETERS
o $expression - The variable you want to export. o $return - If used and set to TRUE, var_export(3) will return the variable representation instead of outputting it. RETURN VALUES
Returns the variable representation when the $return parameter is used and evaluates to TRUE. Otherwise, this function will return NULL. NOTES
Note When the $return parameter is used, this function uses internal output buffering so it cannot be used inside an ob_start(3) callback function. CHANGELOG
+--------+---------------------------------------------------+ |Version | | | | | | | Description | | | | +--------+---------------------------------------------------+ | 5.1.0 | | | | | | | Possibility to export classes and arrays con- | | | taining classes using the __set_state() magic | | | method. | | | | +--------+---------------------------------------------------+ EXAMPLES
Example #1 var_export(3) Examples <?php $a = array (1, 2, array ("a", "b", "c")); var_export($a); ?> The above example will output: array ( 0 => 1, 1 => 2, 2 => array ( 0 => 'a', 1 => 'b', 2 => 'c', ), ) <?php $b = 3.1; $v = var_export($b, true); echo $v; ?> The above example will output: 3.1 Example #2 Exporting classes since PHP 5.1.0 <?php class A { public $var; } $a = new A; $a->var = 5; var_export($a); ?> The above example will output: A::__set_state(array( 'var' => 5, )) Example #3 Using __set_state() (since PHP 5.1.0) <?php class A { public $var1; public $var2; public static function __set_state($an_array) { $obj = new A; $obj->var1 = $an_array['var1']; $obj->var2 = $an_array['var2']; return $obj; } } $a = new A; $a->var1 = 5; $a->var2 = 'foo'; eval('$b = ' . var_export($a, true) . ';'); // $b = A::__set_state(array( // 'var1' => 5, // 'var2' => 'foo', // )); var_dump($b); ?> The above example will output: object(A)#2 (2) { ["var1"]=> int(5) ["var2"]=> string(3) "foo" } NOTES
Note Variables of type resource couldn't be exported by this function. Note var_export(3) does not handle circular references as it would be close to impossible to generate parsable PHP code for that. If you want to do something with the full representation of an array or object, use serialize(3). Warning When var_export(3) exports objects, the leading backslash is not included in the class name of namespaced classes for maximum com- patibility. SEE ALSO
print_r(3), serialize(3), var_dump(3). PHP Documentation Group VAR_EXPORT(3)
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