Replace a string in all files - Unix

Question

I am trying to replace a string ::: with :: for all lines in a batch of txtfiles (it can be considered as a word since there\'s always a space in front

Answer 1

A simple loop to process each file with sed should suffice.

for inp in ./td/*; do
    fname=${inp##*/}
    sed 's/:::/::/g' "$inp" > ./od/"$fname"
done