I am trying to run the same command on multiple servers.
Each server is password authenticated, so I exported SSHPASS.

From option 2 on, --onall is added and commands start to fail.

1. parallel -S 1/user:@ip echo ::: foo shows foo successfully (looks like it uses sshpass automatically?)
2. parallel -S 1/user:@ip,1/user:@ip2 --onall echo ::: foo hangs with no response
3. parallel --ssh "sshpass -e ssh" -S 1/user:@ip,1/user:@ip2 --onall echo ::: foo gives Permission denied, please try again. twice (This is the same error when I purposely give the wrong password in a normal ssh user@ip command, making me think using --oncall stops sending the correct, or any password)
4. parallel --ssh "sshpass -e ssh" --slf iplist --onall echo ::: foo shows the same output as point 3. iplist is the newline separated version of the ips in option 2 and 3, i’m assuming -slf does exactly the same as -S.

Questions

1. How do I run the same command on multiple servers considering it expects a password?
2. Why does –onall make the terminal hang with no response? (Is there any interactive waiting going on under the hood)
3. How to I collect the stdout and stderr results from running the same command in each server back onto the computer that ran parallel together in a single file?