How to remove invisible character?

[Jon M. Hanson]

Josef Lowder wrote:
> .
> I have an ascii text file that seems to have hex 015 
> characters embedded at the end of each line and I can't 
> figure out how those seemingly invisible characters got 
> there or how to remove them.  Their presence causes a 
> shell script that I am trying to use on the target file 
> to not work.  It works on example (a) below, but not on
> example (b).  When I open these files with a text editor 
> (kwrite), the contents looks identical on both (a) and (b)
>
>
>
> $ hexdump -cb exo-20:12 (a)
> 0000000   E   X   O   -   2   0   :   1   2  \n
> 0000000 105 130 117 055 062 060 072 061 062 012
> 000000a
>
> $ hexdump -cb exo-20:12 (b)
> 0000000   E   X   O   -   2   0   :   1   2  \r  \n
> 0000000 105 130 117 055 062 060 072 061 062 015 012
> 000000b
>
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Use dos2unix. The \r\n end-of-line is DOS style. The dos2unix command 
will strip the \r out.