Perl has a wide range of command-line options or switches that
you can use. The options are also called switches because
they can turn on or turn off different behaviors. A thorough knowledge
of the command line switches will enable you to create short one-time
programs to perform odd little tasks. For example, the -e
option lets you specify a line of code directly on the command
line instead of creating a script file. You use the -l
option to change the line endings in a text file.