How to use sed to search a particular pattern in a file backward after a pattern is matched.?


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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.?
# 8  
Quote:
Originally Posted by saurabh kumar
Thanks RudyC for the explanation. The pattern will be
Code:
[digit]{1,}[acd][digit]{1,}

i.e atleast one digit followed by any one of the characters a,c,d and followed by one or more digits.
Which is true for these two lines in file2
Quote:
2388,2391d2387
< 1172c1172
I'd say your regex is not selective enough...?
# 9  
Quote:
Originally Posted by RudiC
Which is true for these two lines in file2I'd say your regex is not selective enough...?
Yes, the regex is not selective enough. Apologies for the miss. I have to add starting with < or > to the above regex.
# 10  
Well, try this on multiple patterns in file2:
Code:
awk     '/< [0-9]+[acd][0-9]+/          {SRC[$2]; next}
         $1 in SRC                      {print PATH}
         $1 ~ /^\//                     {PATH = $1}
        ' file2 file1

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