a stupid performance Q 4

[iribach]

input is
abcde123456

output is
abc
de1
234
56

insert a \n after every 3.char (if present)

the inputfile is large, very very large
sed does not understand \n,
maybe i don't understand sed
vi can do it
:%s/.../&^M/g
but, needs days to do the job
it's a performance Q.
any idea? thanks iribach

 

[Ygor]

Try...
[tt] fold -3 infile > outfile[/tt]
Or...
[tt] dd conv=unblock cbs=3 if=infile of=outfile[/tt]

 

[PHV]

Something like this ?
sed 's!...!&^M!g' /path/to/input | tr '\015' '\012' >output

in ksh, to have ^M type Ctrl+V Ctrl+M (in vi editing mode)

Hope This Helps, PH.
Want to get great answers to your Tek-Tips questions? Have a look at FAQ219-2884 or FAQ222-2244

 

[iribach]

thank you both
fold is new to me
dd is really performant
sed also, maybe i mistyped the ^M