how can i install SSHPASS in BIg IP LTM

HI ,

I am working on bash script for backing up bigip configurations automatically, im going to transfer them to SFTP....unfortunately our SFTP doesnt suppport SSH public key authentication.... how can i pass my SFTP password automatically in the script like SSHPASS...what are the avaiable options to pass my password automatically when it asks for in bash script.

Regards,

Ram