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1. No, they will not abort. In case of actual disk block copying the target will contain garbage.

2. The same as 1. The reading proces will get garbage.

In some situations it could "work" - if...

Replace export m=$m with export m in your script.

Ed example:
v/bb/s/aa/aa bb/g in all lines without 'bb' sustitute 'aa' with 'aa bb'

Use in code like this:

ed filename <<eof
v/bb/s/aa/aa bb/g
w
q
eof

When you say you are able to log in the first time, does that mean after the power cycle?
It seems that the system does not complete all startup procedures for whatever reason.
When you have shell...

Sorry, my mistake.

Hope this will fix it:

grep -e 'aa.*bb' -e 'bb.*aa'

Sed version is nice:

sed -n '/aa/{/bb/p;}'

grep -e aa -e bb

For removing characters tr -d '$' < orig.csv > corrected.csv is more straightforward.