Environment variables in LFTP script

Question

I am trying to run lftp with a script like so:

$ lftp -f deploy.scp

However I would like to use environment variables for l/p inside deploy.scp like so:

open -u $FTP_USER,$FTP_PASSWORD $FTP_HOST;

Is that possible in any way? I have struck out finding any help in the man-pages.

Answer 1

Although it requires the additional tool envsubst, this worked for me via process substitution

lftp -f <(envsubst < lftp_commands.txt)

assuming I've set those environment variables and lftp_commands.txt contains something like

open --user $FTP_USER --password $FTP_PASSWORD $FTP_HOST
put example.txt
exit