Not able use lftp commands running from shellscrip

Question

I'm using set of commands from a shellscript. First command is running fine but it is moving to lftp command prompt and expecting manual input instead of running commands from shelscript. Following are the commands i'm using

lftp -e "$HOST"
lftp -u "$USER,$PWD" 
lftp -e "cd /inbox"
put $file
bye

Please suggest me some solution

Answer 1

Using lower-case variable names to avoid conflicts with local environment variables or shell-builtins ($USER and $PWD are both builtins, so you shouldn't be setting them yourself):

lftp \
  -e "cd /inbox; put $file" \
  -u "$user,$pwd" \
  "$host"

The point, here, is invoking lftp only once, and passing all the necessary commands to that single invocation.