sed replace string in file with variable code example
Example 1: sed replace in file
sed -i 's/foo/bar/g' hello.txt
Example 2: replace using sed
sed -i -e 's/old-text/new-text/g' text.txt
Example 3: sed replace with variable
Just concatenate var '"$var"' to replace values string in sed command:
$ sed -i 's/string_to_replace/'"$var"'/g' file_to_replace.txt
Example 4: sed replace with variable
Use double quotes to make the shell expand variables while preserving whitespace:
sed -i "s/$var1/ZZ/g" "$file"