Remove bashism to port into shell-CodePudding

I'm in trouble with this: what is a way to convert in pure Bourne Shell this BASH snippet?

if [[ -d "$d" ]] && [[ ! -L "$d" ]] && [[ "$OLD_PATH" =~ $d ]]; then
 ...omissis ...
fi

CodePudding user response：

if [ -d "$d" ]; then
 if [ ! -L "$d" ]; then
  if "$OLD_PATH" | grep -Eq "$d"; then

A variable is not something you can execute. You should print the content of the variable to grep.

if
   [ -d "$d" ] &&
   [ ! -L "$d" ] &&
   printf "%s" "$OLD_PATH" | grep -q "$d"
then

I would consider adding -F to grep to match it literally, or using case - the snippet will most probably not work as intended with paths containing [ ] *.