Bash script: repeat command if it returns an error

bash

I would like to create a loop that repeats a ncftp transfer if it returns an error.

I'm a little unsure how the exit code variable can be used in a loop.
Would something like this work?

until [$? == 0]; do
    ncftpput -DD -z -u user -p password remoteserver /remote/dir /local/file
done

Best Answer

I found the basis for this elegant loop elsewhere on serverfault. Turns out there is no need save the exit code, as you can test directly on the command itself;

until ncftpput -DD -z -u user -p password remoteserver /remote/dir /local/file; do
  echo Tansfer disrupted, retrying in 10 seconds...
  sleep 10
done
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