Security examples
Checking for invalid users
find / \( -fsonly hfs -o fsonly vxfs \) -nouser
Checking for null passwords
awk -F: ‘{ if ( $2 == “” ) print $1 }’ /etc/passwd
logins -p
Consistency checkers
pwck, grpck
Checking what users are doing
whodo
Checking for duplicate UID’s
/usr/sbin/logins -d
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