Shell script with EXPECT and PUT to SFTP server

Question

I'm working on a shell script and I'm trying to send a backup file to a sftp server :

remotepath=/backup/
expect -c "
spawn sftp [email protected]
expect "password:"
send "password123\r"
expect "sftp>"
send "put /back_up/bkp_2022.tar.gz $remotepath\r"
expect "sftp>"
send "bye\r"
"

And this is the output that I get without the file being transfer - It just creates "?send put" and "?send byer?".

-rw-r-----. 1 admin admin 1267 Aug 17 11:14 script.sh
-rw-r-----. 1 admin admin    0 Aug 17 11:15 ?send put
-rw-r-----. 1 admin admin  167 Aug 17 11:15 ?send byer?

Can you please help ?

Answer 1

either escape inner quote ("), or use here doc syntax

remotepath=/backup/
expect <<EOF
spawn sftp [email protected]
expect "password:"
send "password123\r"
expect "sftp>"
send "put /back_up/bkp_2022.tar.gz $remotepath\r"
expect "sftp>"
send "bye\r"
EOF

please note that I didn't test