tr problem

Les Mikesell lesmikesell at gmail.com
Fri Jun 13 01:09:15 UTC 2008


Patrick O'Callaghan wrote:

>>>>> The manpage (and pinfo tr too) is, shall we say, completely lacking 
>>>>>> in how to handle the file I/O.
>>>>>>
>>>>> Plus, you probably have a program called dos2unix installed...
>>>> Oops, I should have read past the word 'legacy' which must not have 
>>>> meant what I thought.
>>>> tr '\r' '\n'
>>>> should work.
>>> More like:
>>>
>>>     cat input-filename | tr '\r' '\n' >output-filename
>>>
>>> Not so?  tr is a filter.
>> It reads stdin and writes stdout, like most unix command line programs. 
>>       The shell will connect those to whatever you want with |'s or 
>> <>'s.  Using cat with a pipe is a waste of a process, though.  tr can 
>> read it's own input just as well with <input-filename.
> 
> Quite true, but I remember a remark in one of the classic Unix papers to
> the effect that people somehow found the 'cat foo | ' syntax more
> natural.

I suppose you get used to using cat when there are multiple input files 
that you want to combine.

-- 
   Les Mikesell
    lesmikesell at gmail.com




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