Solaris: Script for adding new local user account

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Solaris: Script for adding new local user account

Here is the script for adding new local user to the Solaris. I commented it well, but here is again my idea:

First check is user is root and check is both arguments are provided (first and last name).
Create the function 'rand2dig' that creates random two digit numbers . This is needed in case username already exists, so random number is added to username.
Create the function that basically do main work, creates user, generates strong password and sends email to admin and user .

The UID (user ID) is next available number from file /etc/passwd.
The command 'useradd' creates new user but with locked account (*LK* in /etc/shadow file), so I use 'mkpasswd' to generate strong password (8 characters) for user.
I also force user to change this password while login for the first time.
Email with default password is sent to user and admin.

Main script:

Use AWK function tolower() to translate argument's uppercase to lowercase
Connect the first and last name and user AWK function length() to check number of characters in username. I want username to be max 8 characters.
If username is less than 8 characters, use it . If already exists, then:

If it's equal 7 characters, remove last one and add random 2 digits number.
If it's less or equal than 6, add random 2 digit number.
Check username existence once again, and exit if it exists. Run script again and most likely will be okay. Understand?

If username is greater (or equal) 8, then use only first 8 characters . If already exists, then:

Replace last 2 characters with random 2 digit number.
Check username existence once again, and exit if it exists. Run script again and most likely will be okay.

That's it

#!/bin/sh
#set -x

# ----------------------------------------------------
# CHECKS: is user root, did you type arguments
# -----------------------------------------------------
# Check if user is root
if [ `/usr/bin/id | awk '{print $1}' | cut -d= -f2 | cut -d\( -f1` != 0 ]
then
        echo ; echo Sorry, you have to be root to run this script. ; echo
        exit 1
fi

# Check if 2 arguments are provided, first and last name
if [ $# != 2 ]
then
        echo ; echo Usage: `basename $0` Last_name First_name ; echo
        exit 1
fi

# --variables
SYSADM=sysadmin@domain.com
# for GCOS-FIELD
FNAME=`echo $2`
LNAME=`echo $1`


# ------------------------------------------------------
#       FUNCTIONS
# ------------------------------------------------------

# ----- Function to create 2 digits random number
 rand2dig () {
        # function srand() sets new seed for random numbers
        RN=`nawk ' BEGIN { srand();  print rand() }'`

        # multiple with 100 and use int() to get 2 digit number
        IN=`(expr ${RN}*100) | bc -l | nawk '{print int($0)}'`
} 
# ---- Function to create user, change passwd, add dir
 adding_user() {
        HOMEDIR=/export/home
        PRIGROUP=staff
        USERSHELL=/usr/bin/tcsh

        # add a user
        useradd -c "${FNAME} ${LNAME}" -d ${HOMEDIR}/${USERNAME} -m -g ${PRIGROUP} -s ${USERSHELL} ${USERNAME} > /dev/null \
        || exit 1

        # Generate 8 alphanumeric random password
        #PASSWORD=`cat /dev/random | tr -dc "[a-z][A-Z][0-9]" | fold -w 8 | head -1`
        # You can use mkpasswd utility, check man mkpasswd
        PASSWORD=`mkpasswd -p /usr/bin/passwd -l 8 ${USERNAME}` || exit 2

        # force user to change password during first login
        /usr/bin/passwd -f ${USERNAME} > /dev/null || exit 3

        # send email to sys admin and user
        echo "New Local User added to ${HOST}: ${USERNAME} \nInitial password : ${PASSWORD} \
        \nGCOS : ${FNAME} ${LNAME} \nHome dir : ${HOMEDIR}/${USERNAME} \nLogin shell : ${USERSHELL} \
        \n-=-=-=-=-=-=-=-=-=-=-=-=-=-= \
        \nNote: After entering the initial password, you'll be prompted to change the same." \
        | mailx -s "New user : ${USERNAME}" ${SYSADM} ${USERNAME}

} 

# -----------------------------------------------------
# MAIN
# ----------------------------------------------------

# connect last and first name
# use nawk function tolower() to translate uppercase characters to lowercase
LAST=`echo $1 | nawk '{ print tolower($0) }`
FIRST=`echo $2 | nawk '{ print tolower($0) }`
FULLNAME=${LAST}${FIRST}

# awk function length() determines lenght of string
LENGHTFN=`echo ${FULLNAME} | nawk '{ print length($0) }'`

if [ ${LENGHTFN} -lt 8 ]
then
         # If lenght < 8 then this is username
        USERNAME=${FULLNAME}
        # Check if username already exists in /etc/passwd file
        if [ "${USERNAME}" = "`cat /etc/passwd | nawk -F: '{print $1}' | gegrep -w ${USERNAME}`" ]
        then
                if [ `echo ${USERNAME} | nawk '{ print length($0) }'` -eq 7 ]
                then
                        rand2dig ; USERNAME=`echo ${USERNAME} | nawk '{ print substr($0,1,6) }'`${IN}
                        # check if randomly generated username exist
                        if [ "${USERNAME}" = "`cat /etc/passwd | nawk -F: '{print $1}' | gegrep -w ${USERNAME}`" ]
                        then
                                echo "Randomly generated username exists. Run script again, exit now !!!"
                                exit 1
                        fi
                        echo Adding local account ${USERNAME} to ${HOST} ; adding_user

                elif [ `echo ${USERNAME} | nawk '{ print length($0) }'` -le 6 ]
                then
                        rand2dig ; USERNAME=${USERNAME}${IN}
                        # check if randomly generated username exist
                        if [ "${USERNAME}" = "`cat /etc/passwd | nawk -F: '{print $1}' | gegrep -w ${USERNAME}`" ]
                        then
                                echo "Randomly generated username exists. Run script again, exit now !!!"
                                exit 1
                        fi
                        echo Adding local account ${USERNAME} to ${HOST} ; adding_user
                fi
        else

        # username doesn't exist in /etc/passwd file, so add it without modification
        echo Adding local account ${USERNAME} to ${HOST} ; adding_user

        fi 
else
         # if lenght >= 8 then use (only) first 8 character
        # use awk function substr()
        USERNAME=`echo ${FULLNAME} | nawk '{ print substr($0,1,8) }'`
        # Check if username already exists in /etc/passwd file
        if [ "${USERNAME}" = "`cat /etc/passwd | nawk -F: '{print $1}' | gegrep -w ${USERNAME}`" ]
        then
                # generate 2 digits random number ${IN}
                rand2dig
                USERNAME=`echo ${USERNAME} | nawk '{ print substr($0,1,6) }'`${IN}
                # check if randomly generated username exist
                if [ "${USERNAME}" = "`cat /etc/passwd | nawk -F: '{print $1}' | gegrep -w ${USERNAME}`" ]
                then
                        echo "Randomly generated username exists. Run script again, exit now !!!"
                        exit 1
                fi
                echo Adding local account ${USERNAME} to ${HOST} ; adding_user
        else

        # username doesn't exist in /etc/passwd file, so add it without modification
        echo Adding local account ${USERNAME} to ${HOST} ; adding_user
        
	fi 
fi

exit 0

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