[bash] Make complex commands slightly more friendly to work with (#2784)

- extract logical parts to separate variables (e.g. $opts)
- put options in $opts in similar order
- move +/-m into $opts (at the end, so they won't be overridden)
- split pipelines into multiple lines
- remove "echo" that seems to be redundant

All this should help with readability and also result in cleaner diffs
when changes are made.

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