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  1. or download this
    #!/usr/bin/env perl

...
while (1) {
    sleep 10;
}
  2. or download this
    PID: 3868
shell> ls -l /proc/3868/fd/
lrwx------.  64 Jan  1 09:55 2 -> /dev/pts/0
l-wx------.  64 Jan  1 09:55 1 -> /tmp/returntozork
lrwx------.  64 Jan  1 09:55 0 -> /dev/pts/0