explainshell
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the parser doesn't support 'arithmetic expansion' constructs in the command you tried
while entering:
tar cf - /folder-with-big-files -P | pv -s $(($(du -sk /folder-with-big-files | awk '{print $1}') * 1024)) | gzip > big-files.tar.gz
it outputs:
the parser doesn't support 'arithmetic expansion' constructs in the command you tried. you may report a bug to have this added, if one doesn't already exist
So, as the output says, i report it.
thank you