How to get the pid of a process and invoke kill -9 on it in the shell script?

First of all; "kill -9" should be a last resort.

You can use the kill command to send different signals to a process. The default signal sent by kill is 15 (called SIGTERM). Processes usually catch this signal, clean up and then exit. When you send the SIGKILL signal (-9) a process has no choice but to exit immediately. This may cause corrupted files and leave state files and open sockets that might cause problems when you restart the process. The -9 signal can not be ignored by a process.

This is how I would do it:

#!/bin/bash

# Getting the PID of the process
PID=`pgrep gld_http`

# Number of seconds to wait before using "kill -9"
WAIT_SECONDS=10

# Counter to keep count of how many seconds have passed
count=0

while kill $PID > /dev/null
do
    # Wait for one second
    sleep 1
    # Increment the second counter
    ((count++))

    # Has the process been killed? If so, exit the loop.
    if ! ps -p $PID > /dev/null ; then
        break
    fi

    # Have we exceeded $WAIT_SECONDS? If so, kill the process with "kill -9"
    # and exit the loop
    if [ $count -gt $WAIT_SECONDS ]; then
        kill -9 $PID
        break
    fi
done
echo "Process has been killed after $count seconds."

pidof gld_http should work if it is installed on your system.

man pidofsays:

Pidof  finds  the process id’s (pids) of the named programs. It prints those id’s on the standard output.

EDIT:

For your application you can use command substitution:

kill -9 $(pidof gld_http)

As @arnefm mentioned, kill -9 should be used as a last resort.