problem in if condition

Shell Programming and Scripting
1

hi,
actully i need the belp for the below.

host_list=" Host1 host2 host3 host4 "

n=`hostname`

i need to put the condition like the below

if n is among the host mention in the host_list if [ n in "$host_list" ]

then

     \#some stugg

else
# some other stuff

fi

2 
#!/bin/sh

host_list="host1 host2 host3 host4"

hostname=$(/bin/hostname)

cmd=$(echo $host_list | grep -ci '$hostname')

if [ "$cmd" != "0" ]; then
        echo "$hostname was found in host_list"
else
        echo "$hostname was not found in the host_list"
fi