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"^${ACCNAME}:[^0-9a-zA-Z./\$]" ?

Something like this will stop when the user enters CTL-D and illustrates saving failed names:


list=""
while read username
do
list="$list,$username" # save list of names, introduces a...

if [[ 'grep -c "$username" /etc/passwd' = "1" ]]

'grep -c "$username" /etc/passwd' will never equal "1", because it's a string, containing the letters grep -c "$username" /etc/passwd". ...

Corona688's grep -q solution is the best, but so you understand how things work I'll try and explain how one gets to it.

1. call grep, and throw away it's output and then examine return...