awk/sed question 1

[ianicr]

Is there a way using awk/sed to add a space after the 4th character of a file on each line? eg. I have a file with
NE234GJ
NE345HJ
that I wish to be
NE23 4GJ
NE34 5HJ

Any help would be grately appreciated.
Thanks

 

[tikual]

sed 's/\(.\{4\}\)\(.*\)/\1 \2/' filename

tikual

 

[ianicr]

Thanks for the speedy response. This works great!

 

[PHV]

Even simpler:

sed 's/^\(.\{4\}\)/\1 /' filename

Hope This Help
PH.