vi / substitution help

[Mike_Ca Li]

Hi:
I have a file with first 4 colums with digits and the rest with characters. I would liek to add a space behind the 4th digit. Thanks.
1234absc
5678detg
..
4567abfcd

how to get

1234 absc
5678 detg
..
4567 abfcd

[Vitek Pepas · Accepted solution]

Try this:
cat file | sed -e 's/\(....\)/\1\ /'

[curt larson_1]

within vi you could try:

$s/^..../& /
or
$s/^\(....\)/\1 /