Ruby Command Line Options
Ruby is generally run from the command line, as follows:
$ ruby [ options ] [.] [ programfile ] [ arguments ... ]The interpreter can be invoked through the following options to control the environment and the behavior of the interpreter.
| Options | description |
|---|---|
| -a | When used with -n or -p, can be opened automatically split mode (auto split mode). See the -n and -p option. |
| -c | Just check the syntax without executing the program. |
| -C thee | Change directory before executing (equivalent to -X). |
| -d | Enable debug mode (equivalent to -debug). |
| -F pat | Pat designated as the default mode of separation ($;). |
| -e prog | Prog designated as a program executed from the command line. You can specify multiple -e option to execute multiple programs. |
| -h | Displays an overview of the command-line options. |
| -i [ ext] | Rewriting the contents of the file output program. The original file will be saved with the extension ext. If ext is specified, the original file will be deleted. |
| And say | Add dir as a directory to load libraries. |
| -K [ kcode] | Multi-byte character sets specified encoding. e or E corresponds EUC (extended Unix code), s or S corresponding to SJIS (Shift-JIS), u corresponding to U or UTF-8, a, A, n, or N corresponds to ASCII. |
| -l | Enable automatic end of line handling. Cancel a newline from input line and output line append a newline character. |
| -n | The input code is placed in a loop (as in gets while; ... end of the same). |
| -0[ octal] | Set the default record separator ($ /) as an octal. If not specified, the default is octal. |
| -p | The input code is placed in a loop. The value of output variable $ _ after each iteration. |
| -r lib | Use require to load lib as a library before execution. |
| -s | Any parameter matching pattern between the program name and the file name of the interpretation parameter -xxx as the switch, and the definition of the corresponding variable. |
| -T [level] | Set the security level, do not purity test (level, if not specified, the default value is 1). |
| -v | Display version and enable redundancy mode. |
| -w | Enable redundant mode. If the file is not specified, reads from STDIN. |
| -x [dir] | Remove the #! Ruby text before the line. If you specify dir , put the directory is changed to dir . |
| -X you | Change directory before performing (equivalent to -C). |
| -and | Parser debug mode is enabled. |
| --copyright | Display the copyright notice. |
| --debug | Enable debug mode (equivalent to -d). |
| --help | Displays an overview of command-line options (equivalent to -h). |
| --version | Display version. |
| --verbose | Enable redundant mode (equivalent to -v). $ VERBOSE is set to true. |
| --yydebug | Enable the parser debug mode (equivalent to -y). |
Single-character command-line options can be combined. The following two lines expressed the same meaning:
$ruby -ne 'print if /Ruby/' /usr/share/bin
$ruby -n -e 'print if /Ruby/' /usr/share/binThis switched: http://codingdict.com/article/6830