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Filter certain number of alphabets

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# 1  
Old 08-05-2010
Filter certain number of alphabets
filter the ones (ex:>1279_17_27_F3) that have 50letters (ABABABACACACACACAADADADADABABABABAACACACACACACAACAC) in input. And others that are less than 50 have to be ignore and the ones with more than 50 have to trimmed to first 50 letters.

Thanx
Code:
>1279_16_1960_F3
A
>1279_16_2010_F3
BCCC
>1279_16_2027_F3
CDDDD
>1279_17_27_F3
ABABABACACACACACAADADADADABABABABAACACACACACACAACAC
>1279_17_39_F3
ABABABABABBACCCCCCCCCCCACACAADADADADADDADADADADADAD
>1279_17_64_F3
CDDDDAAAAAAAAAACADACADACDACADCADCADCABABABABABADADADDDDDADADA

output

Code:
>1279_17_27_F3
ABABABACACACACACAADADADADABABABABAACACACACACACAACAC
>1279_17_39_F3
ABABABABABBACCCCCCCCCCCACACAADADADADADDADADADADADAD
>1279_17_64_F3
CDDDDAAAAAAAAAACADACADACDACADCADCADCABABABABABADADA

# 2  
Old 08-05-2010
Something like this?
Code:
awk '{p=$0;getline}length($0)>=50{print p RS substr($0,1,50)}' file

# 3  
Old 08-05-2010
yes. Thanx alot!
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