Shell Programming and Scripting

alister,

Thanks for your response.
my file contains big single line which includes header,details,tailer and number of records.
example
RA.........RW...RS.....RW....RS.....RW...RS..RT...39214

This RA......... header record(1024 bytes)
RW...RS.....RW....RS.....RW...RS..(38MB approximately)
RT...Tailer record(1024 bytes)
39214 number of records.

User needs as
RA......
RW..
RS...
RW..
RS...
RW..
RS..
..
..
..
..
RT.....
39214

I think probelem is clear. Please help me regarding this.

Assumptions:
1) There are no newlines in your file (except possibly at the very end)
2) The first 1024 bytes are a header which should be left intact
3) There are two 1024 byte records at the end of the file which are also to be left intact
4) All other 1024 byte sequences are to be split into two 512 byte sequences

Code:

fold -b -w1024 file | sed '1n; 2{h;d;}; ${H;g;q;}; $!{x;s/\(.\)/\1\
/512 ;}'

Hi Alister,

I got the solution with your fold option.
I really appreciate your help.

Thanks a lot.....