Crucial Exams

CompTIA Linux+ XK0-006 (V8) Practice Question

After using the command su (without any option) on a Debian 12 server, a junior administrator tries to run several system utilities:

# ifconfig
bash: ifconfig: command not found
# reboot
bash: reboot: command not found
# echo $PATH
/usr/local/bin:/usr/bin:/bin

A quick check shows that /usr/sbin/ifconfig and /sbin/reboot are present on the filesystem. Which action will most quickly restore access to these commands for the current root session and prevent the PATH problem from recurring when switching users in the future?

  • Execute ldconfig to rebuild the shared-library cache used by binaries in /usr/sbin and /sbin.

  • Run chmod 755 /usr/sbin/ifconfig and chmod 755 /sbin/reboot to make the utilities executable.

  • Append /usr/local/sbin to PATH in /etc/profile and reload the file with source /etc/profile.

  • Exit the current shell and re-enter the root account with su - so the full login environment (including /usr/sbin and /sbin) is loaded.

CompTIA Linux+ XK0-006 (V8)
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