whoami

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whoami [OPTION]...

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$ als gewone gebruiker# als root (of met sudo)

1. 1Who am I?

   $whoami
   student

   Your current user.

2. 2After sudo

   $sudo whoami
   root

   Proves that sudo works for you.

3. 3After su

   $su - admin -c whoami
   admin

   The command runs as admin.

4. 4Compare with the login name

   $sudo -i
   #whoami; logname
   root
   student

   whoami = now, logname = who logged in.

5. 5Stop a script that must run as root

   $[ "$(whoami)" = "root" ] || { echo "Run this as root"; exit 1; }

   Many install scripts start with this check. [ "$EUID" -eq 0 ] works too.

6. 6Stop a script that must NOT run as root

   $[ "$(whoami)" != "root" ] || { echo "Do not run as root"; exit 1; }

   Build tools and package managers for users should not run as root.

7. 7Show the user in a prompt or log

   $echo "$(date) $(whoami)@$(hostname): backup started" >> /var/tmp/ops.log

   Who started the job, on which host.

8. 8Check the user of a container

   $podman run --rm registry.access.redhat.com/ubi10/ubi whoami
   root

   Many images run as root by default; a security scan would flag this.

9. 9Check the user of a cron job

   $crontab -l | grep whoami

   Put whoami > /tmp/cron-user.txt in a test job to see which user cron uses.

10. 10Check the user after a privilege escalation test

    $id; whoami

    In a pentest report, whoami output proves the reached privilege level.

11. 11Use it in an SSH check

    $ssh server2 whoami
    student

    Confirms the remote login user (useful with ProxyJump and keys).

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