¿Cuáles son los modos y opciones de Ruby File.open?

Question

Ruby File.open toma modos y opciones como argumentos. ¿Dónde puedo encontrar una lista completa de modos y opciones?

Answer 1

En Ruby IO module documentation, supongo.

Mode | Meaning 
-----+-------------------------------------------------------- 
"r" | Read-only, starts at beginning of file (default mode). 
-----+-------------------------------------------------------- 
"r+" | Read-write, starts at beginning of file. 
-----+-------------------------------------------------------- 
"w" | Write-only, truncates existing file 
    | to zero length or creates a new file for writing. 
-----+-------------------------------------------------------- 
"w+" | Read-write, truncates existing file to zero length 
    | or creates a new file for reading and writing. 
-----+-------------------------------------------------------- 
"a" | Write-only, starts at end of file if file exists, 
    | otherwise creates a new file for writing. 
-----+-------------------------------------------------------- 
"a+" | Read-write, starts at end of file if file exists, 
    | otherwise creates a new file for reading and 
    | writing. 
-----+-------------------------------------------------------- 
"b" | Binary file mode (may appear with 
    | any of the key letters listed above). 
    | Suppresses EOL <-> CRLF conversion on Windows. And 
    | sets external encoding to ASCII-8BIT unless explicitly 
    | specified. 
-----+-------------------------------------------------------- 
"t" | Text file mode (may appear with 
    | any of the key letters listed above except "b"). 

Answer 2

opt es nuevo para ruby ​​1.9. Las diversas opciones están documentadas en IO.new: www.ruby-doc.org/core/IO.html