$ perl --help

Usage: perl [switches] [--] [programfile] [arguments]
  ...
  -a                autosplit mode with -n or -p (splits $_ into @F)
  -e program        one line of program (several -e's allowed, omit programfile)
  -l[octal]         enable line ending processing, specifies line terminator
  -n                assume "while (<>) { ... }" loop around program
  -w                enable many useful warnings
  ...