bash: use outside variables when reading multiple lines into ssh

Question

I apologize if the title doesn't quite describe what I'm looking for. Please edit if possible.

I have a bash script that does the following:

serveruser="root" serverip=1.2.3.4 serverpath="/var/www" ssh "$serveruser"@"$serverip" /bin/bash <<\EOF mkdir -p "$serverpath/mysqldumps/" cd "$serverpath/mysqldumps/" domainname=somedomain.com mysqldump -h 192.168.1.4 -udba -ppassword -c --add-drop-table --add-locks --create-options --databases --quick --lock-tables $domainname > $domainname.sql EOF 

My problem is that the multiple lines I am "feeding" to ssh don't parse the variables I set before. This is obviously because the variables aren't set on the remote machine, only in my local shell. How could I pass these variables or possibly pass multiple lines to ssh in a different way?

Answer 1

The way you're escaping the here-doc word is preventing variable substitution. Contrast

cat <<\END $PATH $LOGNAME END 

versus

cat <<END $PATH $LOGNAME END 

---

update

On closer inspection, I see you're setting a variable in the heredoc. That should not be expanded on the local machine, so you need to escape those in the mysqldump command. Try this:

ssh "$serveruser"@"$serverip" <<EOF mkdir -p "$serverpath/mysqldumps/" cd "$serverpath/mysqldumps/" domainname=somedomain.com mysqldump -h 192.168.1.4 -udba -ppassword -c --add-drop-table --add-locks --create-options --databases --quick --lock-tables \$domainname > \$domainname.sql EOF 

Answer 2

remote_user_name=user instance_ip=127.0.0.1 external=$(ls /home/) ssh -T -i ${private_key} -l ${remote_user_name} ${instance_ip} << END internal=\$(ls /home/) echo "\${internal}" echo "${external}" END 

Answer 3

You need to quote the whole command.. and no need to quote the vars like that put them like ${var}

serveruser="root" serverip=1.2.3.4 serverpath="/var/www" ssh ${serveruser}@${serverip} "/bin/bash <<\EOF mkdir -p ${serverpath}/mysqldumps/ cd ${serverpath}/mysqldumps/ EOF"