linux - Check for ftp authentication output for bash script -

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i run automated backup shell script, works great, reason ftp blocks me few minutes. add retry , wait feature. below sample of code.

   echo "moving external server"    cd /root/backup/ /usr/bin/ftp -n -i $ftp_server <<end_script    user $ftp_username $ftp_password    mput $file    bye end_script

after failed login message below

authentication failed. blocked. login failed. incorrect sequence of commands: pass required after user

i need capture such output , make code atempt sleep few minutes before trying again.

ideas?

if it's possible install additional programs onto system of interest encourage take @ lftp.

with lftp possible set paramters time between reconnects etc. manually.

to achieve aim lftp have invoke following

lftp -u user,password ${ftp_server} <<end set ftp:retry-530 "authentication failed" set net:reconnect-interval-base 60 set net:reconnect-interval-multiplier 10 set net:max-retries 10 <some more custom commands> end

if pattern after ftp:retry-530 matches 530 reply of server lftp tries reconnect every 60*10 seconds.


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