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sed 's|:[^:]*:[^:]*$||' infileor

# echo "John Carey:507-699-5368:29 Albert way, Edmonton, AL 25638:9/3/90:45900" | sed 's|:[^:]*:[^:]*$||'
John Carey:507-699-5368:29 Albert way, Edmonton, AL...

4 echo "John Carey:507-699-5368:29 Albert way, Edmonton, AL 25638:9/3/90:45900" | sed "s/\(.*\):[^:]*:[^:]*$/\1/"
John Carey:507-699-5368:29 Albert way, Edmonton, AL 25638

Here is another (without a trim):
xmltag(){
printf "<%s>%s</%s>\n" "$1" "$2" "$1"
}

while IFS=: read name phone addr dob sal
do
printf "<STUDENTS>\n"
xmltag NAME "$name"
xmltag...

Here is one way of doing it:

#!/bin/bash

trim()
{
trimmed=${1}
trimmed=${trimmed%% }
trimmed=${trimmed## }

echo ${trimmed}
}


IFS=":"

echo "<STUDENTS>"
while...