File checks....

[GGarramuno]

Is there anything in Ruby similar to Perl's if -r, -x, etc. switches?
These switches work with variables as if they were files and they are
used in simple, silent and quick constructs like:
if -r $file {
print "$file is readable\n";
}

Or am I forced to write all the code of File.new() and handle the
rescue exceptions myself?

 

[Michael W Thelen]

Is there anything in Ruby similar to Perl's if -r, -x, etc. switches?
These switches work with variables as if they were files and they are
used in simple, silent and quick constructs like:
if -r $file {
print "$file is readable\n";
}

You can use the FileTest methods, e.g.

FileTest.executable?("/bin/ls") #=> true
FileTest.executable?("/etc/passwd") #=> false

Some documentation is in 'ri', or on the Web here:
http://www.rubycentral.com/book/ref_m_filetest.html

-- Mike

 

[Joel VanderWerf]

Is there anything in Ruby similar to Perl's if -r, -x, etc. switches?
These switches work with variables as if they were files and they are
used in simple, silent and quick constructs like:
if -r $file {
print "$file is readable\n";
}

Or am I forced to write all the code of File.new() and handle the
rescue exceptions myself?

irb(main):001:0> test ?r, "."
=> true

The method is Kernel#test. For details, see rdoc or

http://www.rubycentral.com/book/ref_m_kernel.html#Kernel.test

 

[Gennady]

Is there anything in Ruby similar to Perl's if -r, -x, etc. switches?
These switches work with variables as if they were files and they are
used in simple, silent and quick constructs like:
if -r $file {
print "$file is readable\n";
}

Or am I forced to write all the code of File.new() and handle the
rescue exceptions myself?

Check out methods of module FileTest p FileTest.methods). Class File
extends this module, so you can write:

File.readable? "afile"

If "aFile" does not exist, File.readable? returns false.

Gennady.

 

[Gavin Sinclair]

Is there anything in Ruby similar to Perl's if -r, -x, etc. switches?

Time to read the PickAxe:

www.ruby-doc.org

http://www.amazon.com/exec/obidos/tg/detail/-/0201710897/

These switches work with variables as if they were files and they are
used in simple, silent and quick constructs like:
if -r $file {
print "$file is readable\n";
}

Or am I forced to write all the code of File.new() and handle the
rescue exceptions myself?

See the FileTest module (e.g. in 'ri')

Cheers,
Gavin