如何使用Ruby中的一个命令检查目录/文件/符号链接是否存在 [英] How to check if a directory/file/symlink exists with one command in Ruby
问题描述
我需要一个单一的功能,因为我需要检查可能是目录,文件或符号链接的路径数组。我知道 File.exists?file_path
适用于目录和文件,但不适用于符号链接(这是 File.symlink?symlink_path
)。
标准文件模块具有通常的文件测试可用:
RUBY_VERSION#= > 1.9.2
bashrc = ENV ['HOME'] +'/.bashrc'
File.exist?(bashrc)#=> true
File.file?(bashrc)#=> true
File.directory?(bashrc)#=> false
你应该能够找到你想要的东西。
OP:谢谢,但我需要所有三个真或假
显然不是。好的,尝试一下:
def file_dir_or_symlink_exists?(path_to_file)
File.exist?(path_to_file) File.symlink?(path_to_file)
end
file_dir_or_symlink_exists?(bashrc)#=> true
file_dir_or_symlink_exists?('/ Users')#=> true
file_dir_or_symlink_exists?('/ usr / bin / ruby')#=> true
file_dir_or_symlink_exists?('some / bogus / path / to / a / black / hole')#=>假
Is there a single way of detecting if a directory/file/symlink/etc. entity (more generalized) exists?
I need a single function because I need to check an array of paths that could be directories, files or symlinks. I know File.exists?"file_path"
works for directories and files but not for symlinks (which is File.symlink?"symlink_path"
).
The standard File module has the usual file tests available:
RUBY_VERSION # => "1.9.2"
bashrc = ENV['HOME'] + '/.bashrc'
File.exist?(bashrc) # => true
File.file?(bashrc) # => true
File.directory?(bashrc) # => false
You should be able to find what you want there.
OP: "Thanks but I need all three true or false"
Obviously not. Ok, try something like:
def file_dir_or_symlink_exists?(path_to_file)
File.exist?(path_to_file) || File.symlink?(path_to_file)
end
file_dir_or_symlink_exists?(bashrc) # => true
file_dir_or_symlink_exists?('/Users') # => true
file_dir_or_symlink_exists?('/usr/bin/ruby') # => true
file_dir_or_symlink_exists?('some/bogus/path/to/a/black/hole') # => false
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