Check root privileges in Linux

If any user has UID 0 besides root, To check:

grep ‘x:0:’ /etc/passwd

Check if the user is a member of the root group:

grep root /etc/group

To see if anyone can execute commands as root, check sudoers:

cat /etc/sudoers

To check for SUID bit, which allows programs to be executed with root privileges:

find / -perm -04000

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