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please teach me how to do it

sed -e '/^+/d' passwd.txt

there has several numbers which are:1,2,3,45,6,7,8,9,0,10,34,34,54,122,6756,54,87,99,2,1,45;

how to write a shell script orts the above numbers into descending order and puts them into and arrray...

root:x:0:0:0000-Admin(0000):/:/sbin/sh
rootcsh:x:0:1:0000-Admin(0000):/:/bin/csh
nocol:x:6312:630:NOCOL Monitor,,,:/usr/local/lib/nocol-client:/usr/local/bin/bash
nobody:x:60001:60001:uid no...

my shell script is simple arithmetic process.my addtion,substract and divide all can be worked only except multiplication.please help me.the shell is following:
#!/usr/bin/sh
echo "enter a...