AIX batch create user script

#!/bin/ksh

####Create users in batches####
SuperDir=/dbbackup/ftpuser/ ##User parent directory definition
PGRP=test ##Group definition
set -A username test1 test2 test3 test4 test5 test6 ##Add user list 
for userinfo in ${username[@]}
do
    echo "create user ${userinfo}"
    mkdir -p ${SuperDir}${userinfo}
    ln -s ${SuperDir}${userinfo} /${userinfo}
    OLDUID=$(cat / etc/passwd | grep -v '4294967294'| cut -d ':' -f3 | sort -rn | awk 'Begin {max=0} {if($0>max)max=$0 fi}END{print max}' )
    currentUID=$((OLDUID+1))
    echo $(cat /etc/group | grep -v '4294967294'| cut -d ':' -f3 | sort -rn | awk 'Begin {max=0} {if ($0>max)max=$0 fi}END{print max}')
    mkuser id=${currentUID} pgrp=${PGRP} groups=${PGRP} home=/${userinfo} ${userinfo}
    chown ${userinfo}:${PGRP} ${SuperDir}${userinfo}
done 

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The following commands are executed individually:

查看最大UID
echo $(cat /etc/passwd | grep -v '4294967294'| cut -d ':' -f3 | sort -rn | awk 'Begin {max=0} {if($0>max)max=$0 fi}END{print max}')
查看最大GID
echo $(cat /etc/group | grep -v '4294967294'| cut -d ':' -f3 | sort -rn | awk 'Begin {max=0} {if($0>max)max=$0 fi}END{print max}')