i can able to use the below command to change value of target by means of hard coding.
sed -ie s/^target=.*/target=google.com/ url.properties But if i used variable i am getting error. I dont know how sed commands all working. I only needed to set build system thats it.
url = google.com sed -ie s/^target=.*/target=$url/ url.properties the error is sed: -e expression #1, char 25: unterminated `s' command
The problem may be happening because your URL may contain / which bash interprets as sed syntax, so something like https/www.google.com ends up something like :
sed -ie 's/^target=.*/target=https/www.google.com/' url.properties I will suggest to delimit any special characters to avoid sed to be confused :
url=google.com url=`echo $url | sed -e "s/\//\\\\\\\\\//g"` # delimits backslash in URL's sed -ie "s/^target=.*/target=$url/" url.properties 
s/// command: sed -i "s#target=.*#target=$url#" file
# symbol.
echo $url | sed -e "s/\//\\\\\//g" getting error as sed: -e expression #1, char 9: unknown option to `s'urlTwo problems:
sed command (and ideally the url too)Working example:
url="google.com" sed -ie "s/^target=.*/target=$url/" url.properties 