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echo $? prints the exit status of the last executed command in the terminal. The exit status is a numeric value that indicates whether the command completed successfully or encountered an error. A value of 0 indicates success, while non-zero values indicate an error.


mkdir -p /path/to/root/in/macos
mkdir: cannot create directory ‘/path’: Read-only file system
-p, --parents makes parents directories if needed and no error if existing

echo $?

apt -qqq update -y && apt -qqq upgrade -y; echo $?


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