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search two words in sed


 
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# 1  
Old 07-29-2008
search two words in sed

I've following sed command working fine -
sed '/search_pattern1/ !s/pattern1/pattern2/" file

Now, I want to search two patterns - search_pattern1 and search_pattern2 .


How can put these into above sed statement ?

Thanks in advance.
# 2  
Old 07-29-2008
Code:
sed '/search_pattern1\|search_pattern2/ !s/pattern1/pattern2/" file

Different sed dialects might not want the backslash before the | alternation operator.
# 3  
Old 07-30-2008
This doesn't work.
# 4  
Old 07-30-2008
Do you get a syntax error, or doesn't it do what you expect? Your request can be interpreted at least two ways (lines not containing search_pattern1 or search_pattern2 should have pattern1 replaced with pattern2; or, lines not containing search_pattern1 should have pattern1 replaced with pattern2, and lines not containing search_pattern2 should have some unspecified substitution applied to them) so perhaps you can elaborate with example input, example output, and what exactly you have tried so far.
# 5  
Old 07-30-2008
OK, here is what I want to do

1. I want perform some opreation on the lines which does not have search_pattern1 or search_pattern2.

2. And the operation is - in those lines replace pattern1 by pattern2, if at all pattern1 is present. if pattern1 is not present leave them as it is.


In the case where I 've only one search_pattern, The following command works file -

sed '/search_pattern1/ !s/pattern1/pattern2/" file


Now, I want to add one more word to search "search_pattern2" with "or" condition, I'm not able to fit that into sed.

something like -

sed '/search_pattern1|search_pattern1/ !s/pattern1/pattern2/" file

should work,but it sed treats it like a single word - "search_pattern1|search_pattern1". it does not give a syntaxk error.
# 6  
Old 07-30-2008
Did you try with a backslash before the |?
# 7  
Old 07-30-2008
yes, I did..
with that too, it worked on all the data considering "'/search_pattern1\|search_pattern1/" as one word.

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