You are helping your friend troubleshoot a problem with his Linux server. You enter a common Linux command and discover it doesn’t work exactly as you expected. What might be the problem and what do you do next?
a. The Linux installation is corrupted; restore the system from backup.
b. The Linux shell is not the one you expected; use the echo $SHELL command.
c. You probably don't know how to use the Linux command; search the web for information about the command.
d. The Linux shell is not the one you expected; use the echo $0 command.
Answer: d. The Linux shell is not the one you expected; use the echo $0 command.
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