File::Constants provides file-related constants. All possible file constants are listed in the documentation but they may not all be present on your platform.
If the underlying platform doesn’t define a constant the corresponding Ruby constant is not defined.
Your platform documentations (e.g. man open(2)) may describe more detailed information.
Disables escapes in File.fnmatch and Dir.glob patterns
Wildcards in File.fnmatch and Dir.glob patterns do not match directory separators
The ‘*’ wildcard matches filenames starting with “.” in File.fnmatch and Dir.glob patterns
Makes File.fnmatch patterns case insensitive (but not Dir.glob patterns).
Allows file globbing through “{a,b}” in File.fnmatch patterns.
System default case insensitiveness, equals to FNM_CASEFOLD or 0.
Makes patterns to match short names if existing. Valid only on Microsoft Windows.
open for reading only
open for writing only
open for reading and writing
append on each write
create file if it does not exist
do not block on open or for data to become available
truncate size to 0
disable line code conversion
can delete opened file
any write operation perform synchronously
any write operation perform synchronously except some meta data
do not follow symlinks
do not change atime
Try to minimize cache effects of the I/O to and from this file.
Create an unnamed temporary file
shared lock. see File#flock
exclusive lock. see File#flock
unlock. see File#flock
non-blocking lock. used with LOCK_SH or LOCK_EX. see File#flock
Name of the null device