perl - What does it mean, when Term::ReadKey::ReadKey returns "0"? -


with dumpkeys --long-info called in linux-terminal these values:

# ... 0x0000  nul 0x0001  control_a 0x0002  control_b 0x0003  control_c 0x0004  control_d # ...

when run script , press ctrl a or ctrl b corresponding values.
when press ctrl space readkey returns 0.
null mean value of ctrl space or mean there not set or empty?

#!/usr/bin/env perl use warnings; use strict; use term::readkey;  readmode('cbreak'); print "press keys see ascii values.  use ctrl-c quit.\n";  while (1) {     $char = readkey(0);     last unless defined $char;     printf("$char -> hex: %x\n", ord($char), ord($char)); }  readmode('normal');  # -> hex: 1  # ctrl # -> hex: 2  # ctrl b # -> hex: 4  # ctrl d # -> hex: 0  # ctrl space

showkey -a shows me

^a        1 0001 0x01   #  ctrl ^b        2 0002 0x02   #  ctrl b ^@        0 0000 0x00   #  ctrl space

and in this answer said ctrlspace sends ascii nul i'm assuming 0 ctrlspace 1 ctrla


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