Shell Programming and Scripting

suppose u have a file
P2122 AAJJSKKSKSLSKSKMSKMS
P2123 AASSJMWJNSJNWHNSKSJ
P2126 AHJMKNSAJNSKAKMOKALM
P3533 KKKSJMAKKLLMLMSLMSPM

P2122 JKKSKKMKKSKKKS--------------NSNJ
P2123 NSJN---------MSKMKMKKSLLNSLL
P2126 JNJSJNWKMSK-------------SKKSMK
P3533 JSNSNPWLLL-SKK----SKKKSKKS

so the output shud be
P2122 AAJJSKKSKS LSKSKMSKMS
P2123 AASSJMWJN JNWHNSKSJM
P2126 AHJMKNSAJN SKAKMOKALM
P3533 KKKSJMAKKL LMLMSLMSPM

P2122 JKKSKKMKKS SLSKSKMSKM
P2123 NSJN---------MS KMKMKKSLLN SLL
P2126 JNJSJNWKMS K-------------SKK SMK
P3533 JSNSNPWLL- SKK------SKKK SKKS

In principle this is easy (replace "<b>" by a literal blank):

's/[^<b>]\{10\}/&<b>/g'

But i take it from your example that the substitution should only take place in the middle of a line leaving the other fields intact:

input:
NotToBeChanged 01234567890123456789 NotToBeChanged

output:
NotToBeChanged 0123456789 0123456789 NotToBeChanged

It depends on the structure of your input file how to refine the regexp then. In your example my solution would work because the first field is less than 10 characters long. If you have trouble with it pls come back here.

bakunin

Dear Bakunin
it works for that separating 10 characters but it also starts counts space as characters
so see the result came like
P2123 DRGYIQM THLNKAKTAL GFLLWIVCWA DLFYSFWER

so this output is showing with the space as counted so it affects others So,may be have to ignore the space so sed '/^$s/d' filename
so it is ok then plz incorporate fully with that earlier script

So as output shud be like
P2123 DRGYIQMTHL NKAKTALGFL LWIVCWADLF YSFWER

Thanks