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try
echo $SHELL

also check whether the SHELL environment variable is properly set in the .profile file in your home directory

same for the HOME environment variable also. This also should be...

you can use ssh to directly run commands on remote server like this

ssh root@remote_host "/tmp/script.sh"

This will prompt you for password, unless you have copied your local user's public key...

try using here document in shell script to achieve your requirement

ssh srom@$a << EOF
password
/usr/local/bin/sudo su -
Scripts_you_to_run
exit
EOF