Edit text file using sed or awk -

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i have sample text file shown below:

>chr1 dna:chromosome chromosome:canfam3.1:1:1:122678785:1 ref nnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnn >chr10 dna:chromosome chromosome:canfam3.1:1:1:122678785:1 ref nnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnn >chr11 dna:chromosome chromosome:canfam3.1:1:1:122678785:1 ref nnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnn >chr12 dna:chromosome chromosome:canfam3.1:1:1:122678785:1 ref nnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnn >aaex03020170.1 dna:chromosome chromosome:canfam3.1:1:1:122678785:1 ref nnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnn nnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnntatgtgagaagatagctgaa >aaex03022270.1 dna:chromosome chromosome:canfam3.1:1:1:122678785:1 ref nnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnn nnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnntatgtgagaagatagctgaa >jh373398.1dna:chromosome chromosome:canfam3.1:1:1:122678785:1 ref nnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnn nnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnntatgtgagaagatagctgaa >jh373568.1dna:chromosome chromosome:canfam3.1:1:1:122678785:1 ref nnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnn nnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnntatgtgagaagatagctgaa

the first 4 starts chr1, chr10,chr11 , chr12 , rest starts common prefix aaex , jh.

i delete data lines starting aaex , jh i.e. output should like:

>chr1 dna:chromosome chromosome:canfam3.1:1:1:122678785:1 ref nnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnn >chr10 dna:chromosome chromosome:canfam3.1:1:1:122678785:1 ref nnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnn >chr11 dna:chromosome chromosome:canfam3.1:1:1:122678785:1 ref nnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnn >chr12 dna:chromosome chromosome:canfam3.1:1:1:122678785:1 ref nnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnn

the original file has many such lines starting 'aaex' , 'jh' , convert shown above. help?

this should trick:

$ awk '/>[aj]/{if(!f++)print ">chrx";next}nf' file >chr1 dna:chromosome chromosome:canfam3.1:1:1:122678785:1 ref nnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnn >chr10 dna:chromosome chromosome:canfam3.1:1:1:122678785:1 ref nnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnn >chr11 dna:chromosome chromosome:canfam3.1:1:1:122678785:1 ref nnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnn >chr12 dna:chromosome chromosome:canfam3.1:1:1:122678785:1 ref nnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnn >chrx nnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnn nnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnntatgtgagaagatagctgaa nnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnn nnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnntatgtgagaagatagctgaa nnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnn nnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnntatgtgagaagatagctgaa nnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnn nnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnntatgtgagaagatagctgaa

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