Re: [Sheflug] Apologies for long line length and a newline problem

["Chris J" <cej [at] xxxxxxxxxxxxxxxx>]

And Lo! The Great Prophet "Chris J" uttered these words of wisdom:
> 
> And Lo! The Great Prophet Lesley Anne Binks uttered these words of wisdom:
> >
> > Now in Windows 0x0D 0x0A is the carriage return line feed
> > and on Linux boxes I've always understood it's 0x0D only.
> > Emacs showed the  newlines not as newlines but as ^M 
> > which translates to 0x0D.  Obviously this caused problems on 
> > a search and replace.
> 
> In ksh/sh/bash, this will process /all/ files in the current directory.
> 
> 	for i in *
> 	do
		.
		.
		.

As an extension, as they're files from a Win32 platform. Do any of the 
filenames have spaces in? If so, you'll need to change the 'for i in...' to 
this instead:
	ls | while read i
	do
		if [ -f "$i" ]; then
			mv "$i" /tmp/workfile
			tr -d '\r' < /tmp/workfile > "$i"
		fi
	done

Note the pipe to while and that $i is in "double quotes".

Standard UNIX will tokenise the file at spaces (so a file called "This Is
A File.txt" is seen as four entities, which generally doesn't work. Another
way of getting round this is to fiddle with the IFS environment variable,
something like this (untested):

	oldIFS=$IFS
	IFS=<get a newline character here>
	for i in *
	do
		.
		.
		.
	done
	IFS=$oldIFS


And finally (in lessons of shell-token parsing): recent shells expand '*' 
without the problem of spaces, so the original for loop would work (however 
"for i in `ls`" wouldn't). You will still need to double quote the variable 
though within the loop to ensure the filename gets treated as a single 
entity within it.

In short, the most portable is the ls pipe to while -- this should work 
regardless of ksh/sh/bash shell version. If anyone is a csh, tcsh or zsh 
user then you'll have to consult your manpages.

HTH,

Chris...

-- 
\ Chris Johnson                 \ NP: 
 \ cej [at] nightwolf.org.uk          \  
  \ http://cej.nightwolf.org.uk/  \ 
   \ http://redclaw.org.uk/        ~---------------------------------------


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