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I don't know what a preemptive, multitasking, multiprocessing OS is let alone how it relates to my question

I have a text file called file1 which contains the text: "ls -l"
When I enter this command:
bash < file1 > file1
file1 gets erased. However if I enter this command:
bash < file1 > newfile
the...

This is the command. Assume file1 exists but file2 does not:
ls file1 file2 >newfile 2>&1

This simply makes a text file with two lines: file1 \n file2 could not be found. What I don't understand...

Sometimes it works for me and sometimes I get this error:
syntax error on line 1, teletype
Basically I've got no idea whats going on, especially at the end of the command: bc

Any help is...

Where did the -10 come from?

Assume that the text file contains over 40 lines. How do you do this?!?!?

Is it possible for both commands to work?