Certainly, here's an explanation of the other characters listed:
A. `!`: The exclamation mark `!` is often used in shell history commands to refer to previous commands. For example, `!n` refers to the command with job number `n`. It is not used to run a command in the background.
B. `+`: The plus sign `+` is not commonly used to run commands in the background. It's typically used in job control to bring a background job to the foreground, but not to start a command in the background.
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DuboisNicolasDuclair
1 year, 4 months ago