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Top Forums Shell Programming and Scripting How to use sed to search a particular pattern in a file backward after a pattern is matched.? Post 302834177 by saurabh kumar on Thursday 18th of July 2013 12:27:20 PM
Old 07-18-2013
Thank you raja and RudiC.

These solutions seems to work for most of the test-cases. Haven't had much experience with awk. Please let me know ,if I understand correctly these solutions

Raja,
In the first line you extracted the pattern from file2 and stored them in a variable var. Then in the second line for any line starting with / the whole line($0) is stored in a and then you perform a match with pat($0~pat) and print a .Can you please explain how does matching $0 with pat works because $0 will contain the path and pat will contain the pattern(1172c1172).

RudyC,
Can you please explain your solution .Will this solution work if file2 has more than one entry
Code:
2388,2391d2387 < 1172c1172 < <          apple, banana, orange < --- < >          apple, banana, mango
1277,1280d1276 < 117c117 < <   	silent, helpful < --- < >  	silent

 

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ARRAY_UNSHIFT(3)							 1							  ARRAY_UNSHIFT(3)

array_unshift - Prepend one or more elements to the beginning of an array

SYNOPSIS
int array_unshift (array &$array, mixed $value1, [mixed $...]) DESCRIPTION
array_unshift(3) prepends passed elements to the front of the $array. Note that the list of elements is prepended as a whole, so that the prepended elements stay in the same order. All numerical array keys will be modified to start counting from zero while literal keys won't be touched. PARAMETERS
o $array - The input array. o $value1 - First value to prepend. RETURN VALUES
Returns the new number of elements in the $array. EXAMPLES
Example #1 array_unshift(3) example <?php $queue = array("orange", "banana"); array_unshift($queue, "apple", "raspberry"); print_r($queue); ?> The above example will output: Array ( [0] => apple [1] => raspberry [2] => orange [3] => banana ) SEE ALSO
array_shift(3), array_push(3), array_pop(3). PHP Documentation Group ARRAY_UNSHIFT(3)
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