From a Bash shell, which of the following commands directly executes the instruction from the file /usr/local/bin/runme.sh without starting a subshell? (Please select TWO answers.)
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A. B. C. D. E.AB
The correct answers are B and D.
B. The "." command (also known as the "dot operator") is used to source a file, which essentially means to execute the commands in the specified file in the current shell environment. This is done without starting a subshell, so any changes to environment variables or other shell settings made by the commands in the file will affect the current shell. Therefore, the command ". /usr/local/bin/runme.sh" will directly execute the instructions in the file /usr/local/bin/runme.sh without starting a subshell.
D. This command directly executes the instruction from the file /usr/local/bin/runme.sh without starting a subshell. This is because the file is executable and the path to the file is specified, so the Bash shell will simply execute the commands in the file in the current shell environment.
A. The "source" command is similar to the "." command in that it sources a file in the current shell environment. However, the "source" command is not required to execute the commands in the file and it does not have to be executable. The command "source /usr/local/bin/runme.sh" will execute the commands in the file /usr/local/bin/runme.sh in the current shell environment, but it will also start a subshell.
C. This command specifies the shell to use to execute the file /usr/local/bin/runme.sh, which is /bin/bash. However, this command will start a subshell to execute the file, so any changes made to environment variables or other shell settings by the commands in the file will not affect the current shell.
E. This command is not a valid Bash command and will not execute the file /usr/local/bin/runme.sh.