Replacing CR (\r) character with sed

[Denis Vlasenko]

On Saturday 24 February 2007 12:33, Alexander Kriegisch wrote:
> I wonder how I can make sed work as a replacement for dos2unix. I do
> know how to strip CR characters with tr or dos2unix, but I have reasons
> to do it with sed besides just wanting to know how. Those reasons include
>   - a bug in some tr versions making it strip special characters like
>     German umlauts unintentionally (I have no influence on the version
>     of tr used by other people) and
>   - dos2unix not being part of our DSL router firmware mod's busybox
>     (again, I have it, but many others don't).
> 
> I played around with several variants working in other sed versions,
> tried to use basic regex mode as well as the -r switch for extended
> regex syntax, but to no avail. BTW, I have not tried to put the sed
> script into a file, as I want to use it as a command line argument.

bash-3.2# echo -ne 'dos\r\ntext\r\n' | hexdump -C
00000000  64 6f 73 0d 0a 74 65 78  74 0d 0a                 |dos..text..|
0000000b

bash-3.2# echo -ne 'dos\r\ntext\r\n' | sed $'s/\r//g' | hexdump -C
00000000  64 6f 73 0a 74 65 78 74  0a                       |dos.text.|
00000009

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vda