Shell Programming and Scripting

[root@atlas /]# true
[root@atlas /]# echo $?
0
[root@atlas /]# false
[root@atlas /]# echo $?
1
[root@atlas /]#

function f(){
exit 0
}

[root@atlas /]# groups root | grep -q wheel
[root@atlas /]# echo $?
0
[root@atlas /]# groups root | grep -q asdf
[root@atlas /]# echo $?
1
[root@atlas /]#

groups test | /usr/xpg4/bin/grep -q other

groups test | grep other >/dev/null 2>&1

#!/bin/bash

user_belongs()
{
if `groups $var1 | /usr/xpg4/bin/grep -q $var2`
then
return 0 else
return 1
fi

}



home_dir="/export/home/catalin"
username="catalin"
strOwner="owner"
strUser="user"
strGroup="group"
strOther="other"
strNoRights="---"

for i in $(ls -F $home_dir)
do
   #echo $i
   user_rights=`getfacl $i | grep $strUser | cut -d: -f3`
   group_rights=`getfacl $i | grep $strGroup | cut -d: -f4`
   other_rights=`getfacl $i | grep $strOther | cut -d: -f2`
   owner_file=`getfacl $i | grep $strOwner | cut -d: -f2`
   group_file=`getfacl $i | grep $strGroup | cut -d: -f2`
   other_file="other"

#echo "$owner_file"
  
if [ " $username" != "$owner_file" ]; 
then

             echo "Username $username is not the owner of the file $i"

             if user_belongs $username $group_file
             then
                 echo "Username $username belongs to $group_file group   
                 if [" $group_rights" = "$strNoRights"] 
                 then
                     if user_belongs $username $other_file
                     then
                         echo "Username $username belongs to $other_file group   
                         if [" $other_rights" = "$strNoRights"] 
                         then
                            
                            REASON="Forbidden file $i in the home directory of the user $username found."
                          
                            echo "Username $username from group other has no rights to access file $i" 
                         fi

                     fi

                 fi

             fi 
else 

             
              REASON="Forbidden file $i in the home directory of the user $username found."
             

fi

        
done