Command Line Basics - The Shell

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Linux Essentials Objective 2.1 looks at Command Line Basic. We start this by looking at the shell. What it is and what types of shells there are. The Type command and using echo.
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where linux kernel save to return of programme ?
when i execute "echo $? " it will print last return of programme
i have project with raspberry pi  i want to save all return error with command to file log that user execute
can you help me ?

benasalim