sed: -e expression #1, char 15: unterminated `s' command

blackrhino

This error just means there a syntax error, line one, and character 15, the unterminated "s", mean there no trailing slash.

$ sed -e 's/drive/gardens' data_file 
sed: -e expression #1, char 15: unterminated `s' command

Adding the trailing "/", changes everything

$ sed -e 's/drive/gardens/' data_file 
hamster, furry little creature, 2 hamster gardens
donkey, back breaking helper, 8 donkey jacket road
horse,  top racer, 12 Horse throat Lane
badger,  night rider, 15 Badger Close 
cow,  love eating grass all day, 16 Moofield Aveune
sheep, can you take this coat off, 6 Wool road