Shell Programming and Scripting

#!/usr/bin/sh
#
# SCRIPT:    lab5
# AUTHOR:    
# DATE:        8/15/2012
# REV:        1.0A
# PLATFORM:    Linux
# PURPOSE:    Maintain Health of the /etc/passwd file by checking for 
#        duplicate UID's, root ID, duplicate login names,
#        expiration date, entries with no password.
#
#
# REV LIST:
#    DATE:    8/16/2012
#    BY:    
#    MDIFICATION:    add awk for duplicate UID and login name check.
#
#
#
###############################################################################
##################### DEFINE FILES AND VARIABLES HERE #########################
###############################################################################

#    NO VARIABLES


###############################################################################
######################### DEFINE FUNCTIONS HERE ###############################
###############################################################################


#    NO FUNCTIONS


###############################################################################
######################### BEGINNING OF MAIN ###################################
###############################################################################

# This line checks for the root ID. It notifies the user if the root ID 
# exists or not.
echo "Check for root uid..."
awk -F: '$1 = ~/root/ {print "Found Root ID"} ' /etc/passwd        

# Check for duplicate UID by reading the records into an awk array
# and compare the predecessor with the successor. If the comparison 
# result is greater as 1 print the duplicate value.
echo "Check for duplicate UID's..."
awk -F:  'uname[$3]++ && uname[$3]>1 {print "duplicate user:", $1} ' /etc/passwd
echo "Duplicate UID check done"


# Check for duplicate UID by reading the records into an awk array
# and compare the predecessor with the successor. If the comparison 
# result is greater as 1 print the duplicate value.
echo "Check for duplicate user names..."
awk -F:  'uid[$3]++ && uid[$3]>1 {print "duplicate uid:", $3}' /etc/passwd
echo "Duplicate user name check done."

echo "Check for passwords..."

# I am not sure about that one !
#`exec su | sh | awk -F: '$2 ~/$\d$/ {print "User $1 has password}' /etc/shadow |  exit` 
exit 0


# End of Script