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How to grep at nth position?

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# 1  
Old 04-25-2008
How to grep at nth position?
Suppose the data is as follows:

123456789A123456
123456789A123456
123456789C123456
123456789B123456
123456789A123456

I want to grep only those records containing "A" command can be:
grep "^.........A" file_name

But if data string is very long, suppose A occurs at 690th position.
Its doesn't look good giving 690 dots and then "A"....I am sure there must be some alternative.

Please help!

-Sumit
# 2  
Old 04-25-2008
Code:
egrep '^.{690}A' file_name

# 3  
Old 04-25-2008
It works.

Thanks a lot!
sumit
# 4  
Old 04-25-2008
Sorry, if column number is less than 255 then it works if it is more than 255 its giving error
--
$egrep '^.{256}A' fl
egrep: context of \{\} invalid
# 5  
Old 04-25-2008
Any further help?
# 6  
Old 04-25-2008
Find a less broken version of egrep (installing the GNU tools will pay itself back a million times), or use a different tool which supports the same syntax.

Code:
perl -ne 'print if m/^.{690}A/' file

# 7  
Old 04-25-2008
Era you are a genius....perl works perfectly!!

Thanks once again!
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