about detecting dos file in linux OS

yubemen · 05-29-2007, 09:36 AM

Hi,i got a question.
I want to know if there is some command to use to detect dos file in Linux OS.
Some people told me with "grep -l '^M' filename ",but i try it and find it doesn't work.Maybe it works in Unix OS.
If you know how to do it ,please tell me ,thanks.

druuna · 05-29-2007, 09:44 AM

Hi,

I don't know if the file command could help. It can determine file types and is not limited to dos files.

Take a look at the man page, or here (online version).

Hope this helps.

bartonski · 05-29-2007, 10:28 PM

I did a quick test using file, here's what I found:

Code:

>file testfile.txt

testfile.txt: ASCII English text, with CRLF line terminators

so... file works. If that hadn't worked, I would have gone for

the -v option on cat makes non-printable characters printable.

Code:

>cat -v testfile.txt
These are the days of miracle and wonder^M
^M

If you absolutely need to know what's in a file, bring out the heavy guns and use od:

Code:

>od -c testfile.txt
0000000   T   h   e   s   e       a   r   e       t   h   e       d   a
0000020   y   s       o   f       m   i   r   a   c   l   e       a   n
0000040   d       w   o   n   d   e   r  \r  \n  \r  \n
0000054

yubemen · 05-30-2007, 05:06 AM

Thanks you druuna.
Thanks bartonski for your script about my question.
For a single file, I do know how to detect if it is a dos file or others,
but if there are many files need to detect, i just want to detect them with simple command.For this,is there much better method to resolve it?
Through File command,i can do it.But i think it is not the best one.
< find ./ -type f | xargs file | grep "CRLF" | awk -F: '{print $1}' >

If someone know the better method, please tell me.

Thanks.

bartonski · 05-31-2007, 01:41 PM

grep -Pr "\r" .

-P uses Perl regular expressions, therefore understands "\r" as a carriage return.
-r does a recursive grep.

Your find isn't too shabby though.

bartonski · 05-31-2007, 01:44 PM

Come to think of it, you probably want

grep -Prl "\r" .

The -l option prints the name of a matching file, without printing the line that matches.

yubemen · 05-31-2007, 11:14 PM

Thanks bartonski.
That is what i want.very great!

In my pc,the man content of grep is old.(2000/06/09)
So i cann't find the option of "-P".
But grep version is like this : grep (GNU grep) 2.5.1 .
and it has had the function to deal with "-P",i didn't notice it.

Ok,i got my question to be resoled.
Thanks all.

yubemen