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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 | #! /bin/bash #list user who belong to more than one group #and list user who belong to the group which isn't the same as the username #w is whitelist,we will not think user in this whitelist is special or dangerous w=( "root" "adm" "games" "operator" "halt" "shutdown" "sync" "daemon" "bin" "operator" ) function WhiteList() { for i in ${w[@]} do if [ "$i" == "$1" ]; then return 1 fi done return 0 } IFS=" " for LINE in ` cat /etc/ passwd | awk -F: '{print $1}'` do WhiteList $LINE; #if $? equal 1,means it is in the whitelist if [ $? - eq 0 ]; then a=` groups $LINE| awk -F: '{print $2}'` b=` echo $a` if [ "$b" != "$LINE" ]; then #echo $LINE echo ` groups $LINE` fi fi done |