text manipulation help

[galford]

Hello,

How can I replace in a text document a space " " with ":"?

[vgersh99]

sed 's/ /:/g' myFile

[Corona688]

tr ' ' ':' < input > /tmp/$$
# You should check the contents of /tmp/$$ before overwriting 'input' with it
cat /tmp/$$ > input
rm /tmp/$$

[galford]

Thanks.