$' r' command not found linux code example

Example 1: run.sh: line 39: $'\r': command not found

sed -i 's/\r$//' filename

Example 2: $'\r': command not found

Inside WSL:

sudo apt-get install dos2unix

Then,

dos2unix [file]

Full documentation:

man dos2unix
#mdem
dos2unix test.sh

Example 3: $'\r': command not found

sed -i 's/\r$//' filename