Programming Ruby 3.3

Ruby Command-Line Options

Following is a complete list of Ruby’s command-line options roughly organized by functionality.

Options That Determine What Ruby Runs

-0[octal]

The 0 flag (the digit zero) specifies the record separator character (\0, if no digit follows). -00 indicates paragraph mode: records are separated by two successive default record separator characters. 0777 reads the entire file at once (because it’s an illegal character). Sets $/.

-a

Autosplit mode when used with -n or -p; equivalent to executing $F = $_.split at the top of each loop iteration.

-c

Checks syntax only; does not execute the program.

--copyright

Prints the copyright notice and exits.

-e ’command’

Executes command as one line of Ruby source. Several -es are allowed, ...