tar & split remote files saving output locally remove "tar: Removing leading `/' from member names" message from output - bash

Question

This is a 2 part question.
Ive made a bash script that logs into a remote server makes a list.txt and saves that locally.
#!/bin/bash
sshpass -p "xxxx" ssh user#pass ls /path/to/files/ | grep "^.*iso" > list.txt
It then starts a for loop using the list.txt
for f in $(cat list.txt); do
The next command splits the target file and saves it locally
sshpass -p "xxxx" ssh user#pass tar --no-same-owner -czf - /path/to/files/$f | split -b 10M - "$f.tar.bz2.part"
Question 1
I need help understanding the above command, why is it saving the *part files locally? Even though that is what I intend to do I would like to understand it better, How would I do this the other way round, tar and split files saving output to remote directory (flip around what is happening in the above command using the same tools sshpass is a requirement)
Question 2
When running the above command even though I have made it not verbose it still prints this message
tar: Removing leading `/' from member names
How do I get rid of it as I have my own echo output as part of the script I have tried the following after searching online but I think me piping a few commands together confuses tar and breaks the operation.
I have tried these with no luck
sshpass -p "xxxx" ssh user#pass tar --no-same-owner -czfP - /path/to/files/$f | split -b 10M - "$f.tar.bz2.part
sshpass -p "xxxx" ssh user#pass tar --no-same-owner -czf -C /path/to/files/$f | split -b 10M - "$f.tar.bz2.part
sshpass -p "xxxx" ssh user#pass tar --no-same-owner -czf - /path/to/files/$f | split -b 10M - "$f.tar.bz2.part > /dev/null 2>&1
sshpass -p "xxxx" ssh user#pass tar --no-same-owner -czf - /path/to/files/$f > /dev/null 2>&1 | split -b 10M - "$f.tar.bz2.part
All of the above break the operation and I would like it to not display any messages at all. I suspect it has something to do with regex and how the pipe passes through arguments. Any input is appreciated.
Anyways this is just part of the script the other part uploads the processed file after tar and splitting it but Ive had to break it up into a few commands a 'tar | split' locally, then uploading via rclone. It would be way more efficient if I could pipe the output of split and save it remotely via ssh.

Answer 1

First and foremost, you must consider the security vulnerabilities when using sshpass.
About question 1:
Using tar with -f - option will create the tar on the fly and will send to stdout.
The | separates the commands.
sshpass -p "xxxx" ssh user#pass tar --no-same-owner -czf - /path/to/files/$f - Runs remotely
split -b 10M - "$f.tar.bz2.part" - Runs in local shell
The second command reads the stdin from the first command (the tar output) and it creates the file locally.
If you want to perform all the operations in the remote machine, you could enclose the rest of the commands in quotes like this (read other sources about qouting).
sshpass -p "xxxx" ssh user#pass 'tar --no-same-owner -czf - /path/to/files/$f | split -b 10M - "$f.tar.bz2.part"'
About question 2.
tar: Removing leading '/' from member names is generated by tar command which sends errors/warnings to STDERR which in the terminal, STDERR defaults to the user's screen.
So you can suppress tar errors by adding 2>/dev/null:
sshpass -p "xxxx" ssh user#pass tar --no-same-owner -czf - /path/to/files/$f 2 > /dev/null | split -b 10M - "$f.tar.bz2.part