How to replace multiple occurrences in a string with sed?

Question

linux

Tell me, you need to convert the permissions displayed by the ls -l command from the rwx type to the read-write-execute type, without replacing r, w, x in the rest of the output.

Answer 1

Maybe so?
a=$(ls -l | tail -n +2)
while read line
do
b=$(echo "$line" | awk '{print $1}' | sed -e 's/r/read/g' | sed -e 's/x/execute/g' | sed -e 's/w/write/g' )
c=$(echo "$line" | awk '{for (i=2; i<=NF; i++ ) print $i}')
echo $b $c >> ls.txt
done <<< "$a"