LFTP mirror upload only non existing files to remote directory

Question

Every 5 minutes some new files are downloaded via lftp to a local directory. I need to upload to another ftp only the non existing files. My script so far is:

#! /bin/bash
today=$(date +%Y%m%d)
today_files="rec."$today"_"
programa_dir="/home/user/local-dir"

# Download files, that do not exist in the local directory
lftp <<EOF
open -u user,pass ftp1
mget "$today_files*" -O $programa_dir
bye
EOF

# Upload the files

lftp <<EOF
open -u user,pass ftp2
lcd $programa_dir
mirror -R
bye
EOF

The mirror -R command doesn't recognize that only few files do not exist on the remote directory of the second ftp.

Is there a way to fix that? I need only to check the filename's , not the creation or the modification time of the files.

For the second ftp I tried

lftp <<EOF
open -u user,pass ftp2
mput $programa_dir/* -O /
bye
EOF

The result was the same - lftp upload all the files, no only the non existing.

Answer 1

I don't have access to LFTP at the moment, but I suspect you're looking for the --only-missing param, which is only usable with mirror.

Try this:

lftp <<<EOF
open -u user,pass ftp2
mirror --reverse --only-newer $programa_dir/* /
bye
EOF

Answer 2

If you add set xfer:clobber off; to the lftp command script, it will avoid overwriting existing files.