How can I tell if STDIN is connected to a terminal in Perl?
Question
How can I tell if STDIN is connected to a terminal in Perl?
Solution
if (-t STDIN) {
# stdin is connected
} else {
# stdin is not connected
}
I usually use this in conjunction with -t STDOUT, to find out if I'm running from an interactive shell, or from cron, to enable more output.
OTHER TIPS
You might also be interested in IO::Interactive to figure out if Perl thinks it is interacting with a user. Simply being connected to a tty doesn't mean the user is going to see what you do.
One solution would be to use tty:
[root@server] ~> tty
/dev/pts/0
[root@server] ~> echo y | tty
not a tty
But not very pretty...
Licensed under: CC-BY-SA with attribution
Not affiliated with StackOverflow