How to run the sftp command with a password from Bash script?

You have a few options other than using public key authentication:

  1. Use keychain
  2. Use sshpass (less secured but probably that meets your requirement)
  3. Use expect (least secured and more coding needed)

If you decide to give sshpass a chance here is a working script snippet to do so:

export SSHPASS=your-password-here
sshpass -e sftp -oBatchMode=no -b - sftp-user@remote-host << !
   cd incoming
   put your-log-file.log
   bye
!

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