CR/LF and read is shell scripts

[Fifer, Eric]

Eirik_Nordbrøden <eirik.nordbroden@scandpower.no> wrote:
> The script generates a temporary file by the use of the echo
> statement and later on the content is evaluated with a cat and consecutive
> read statements. The problem is that the generated file contains CRLF at
the
> end of each line, but the read statement only recognises the LF and
therefore
> adds CR to the last variable read.

The behavior of cat seems to have changed (presumably
after the textutils-2.0 upgrade on 7/8).  Formerly,
it performed CR/LF mapping based on the binary/text
mode of the input file.  Now it is always in binary
mode, unless you're adding numbers (or other non-verbatim
options).  In these examples x has "hello\r\n":

$ od -c x
0000000   h   e   l   l   o  \r  \n
0000007

On binary mount:
$ cat x | od -c
0000000   h   e   l   l   o  \r  \n
0000007
$ cat -n x | od -c
0000000                       1  \t   h   e   l   l   o  \r  \n
0000016

On text mount:
$ cat x | od -c
0000000   h   e   l   l   o  \r  \n
0000007
$ cat -n x | od -c
0000000                       1  \t   h   e   l   l   o  \n
0000015

There are old threads discussing how people disliked
the text behavior of cat.  However, I think the old
behavior of cat should be restored.  And, for those
who need binary behavior there is now a -B/--binary
option.

Any other opinions?

Eric Fifer




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