while (<>) {
  chomp;
  printf "input as string=%s, as decimal=%d\n", $_, $_;
}'
# now user does input:
65
input as string=65, as decimal=65
0x41
Argument "0x41" isn't numeric in printf at -e line 5, <> line 2.
input as string=0x41, as decimal=0
"65"
Argument ""65"" isn't numeric in printf at -e line 5, <> line 3.
input as string="65", as decimal=0

##</code><code>##

> while read a; do
> printf "string=%s, as decimal=%d\n" $a $a
> done
65
string=65, as decimal=65
0x41
string=0x41, as decimal=65
"0" 
string="0", as decimal=48
"0x30"
string="0x30", as decimal=48