Shell Programming and Scripting

$ cat example.dat
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$ cat getline3.awk 
function getName (NOM)
{
printf "Enter a filename: "
getline NOM < "-" # get response
return NOM
}

BEGIN {
printf ("\nREP: %s\n",getName(N)) 
} 
{print}

$ awk -f getline3.awk example.dat
Enter a filename: EXAMPLE

REP: EXAMPLE
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$ awk -f getline3.awk <example.dat
Enter a filename: 
REP: 1
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function getName (  NOM)
{
   printf "Enter a filename: "
   "head -1 < /dev/tty" | getline NOM
   close("head -1 </dev/tty");
   return NOM
}

BEGIN {
printf ("\nREP: %s\n",getName()) 
} 
{print}

Final code:
function getName (NOM)
{
printf "Enter a filename: "
getline NOM < "/dev/tty"
close("/dev/tty")
return NOM
}

BEGIN {
printf ("\nREP: %s\n",getName(N))
}
{print}