- $0 ($PROGRAM_NAME)
The name of the file containing the running perl script.
- $| ($OUTPUT_AUTOFLUSH)
Causes a fflush after each write or print if true. Usually
set in cgi scripts by $|++ or $|=1;
- $\ ($OUTPUT_RECORD_SEPARATOR)
Similar to awk's ORS. Rarely used.
The parenthesis are the "English" names (you can use those if
you say
use English;
at the top of your script).