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calling curl inside .sh file

I have setenv.sh file used by tomcat, I can set java otpions in this sh file.
I want to use curl to get a value capture it in a variable and use it as a java opts its not working , please help me .Here is my script

Code:

#!/bin/sh

export JAVA_HOME=/opt/java

export JAVA_OPTS="-Xms1024m -Xmx1024m -XX:MaxPermSize=256m"

JAVA_OPTS="${JAVA_OPTS} -Dcom.sun.management.jmxremote.ssl=false"

JAVA_OPTS="${JAVA_OPTS} -Dcom.sun.management.jmxremote.authenticate=false"

PUBLIC_DNS=curl http://169.254.169.254/latest/meta-data/public-hostname



#export PUBLIC_DNS="${PUBLIC_DNS}"

JAVA_OPTS="${JAVA_OPTS} -Djava.rmi.server.hostname=${PUBLIC_DNS}"

echo "JAVA_OPTS=${JAVA_OPTS}"

CATALINA_PID=/var/run/tomcat.pid

I am assuming PUBLIC_DNS=curl http://169.254.169.254/latest/meta-data/public-hostname will get the value into PUBLIC_DNS , but this is always blank.
Please advice me whats wrong.

try to replace

Code:

PUBLIC_DNS=curl http://169.254.169.254/latest/meta-data/public-hostname

with

Code:

PUBLIC_DNS='curl http://169.254.169.254/latest/meta-data/public-hostname'

Quote:

Originally Posted by notihnio (Post 4699276)

try to replace

Code:

PUBLIC_DNS=curl http://169.254.169.254/latest/meta-data/public-hostname

with

Code:

PUBLIC_DNS='curl http://169.254.169.254/latest/meta-data/public-hostname'

Nope. You have to use backticks instead of single quotes or the $(cmd) form.
The correct forms are

Code:

PUBLIC_DNS=`curl http://169.254.169.254/latest/meta-data/public-hostname`

PUBLIC_DNS=$(curl http://169.254.169.254/latest/meta-data/public-hostname)