[CentOS] perl code to remove newlines

Jerry McAllister jerrymc at msu.edu
Thu Dec 30 22:41:01 UTC 2010


On Thu, Dec 30, 2010 at 08:19:00AM -0500, ken wrote:

It isn't perl, but does 'tr' exist in CentOS (it does in FreeBSD)?
It would do it.

////jerry


> 
> Given an HTML file which looks like this:
> 
> --------- begin snippet ---------
> <HTML
> ><HEAD
> ><TITLE
> >We've Lied to You…</TITLE
> ><META
> NAME="GENERATOR"
> CONTENT="Modular DocBook HTML Stylesheet Version 1.79"><LINK
> REL="HOME"
> TITLE="Maximum RPM"
> HREF="index.html"><LINK
> REL="UP"
> TITLE="Using RPM to Verify Installed Packages"
> HREF="ch-rpm-verify.html"><LINK
> ...
> --------- end snippet ---------
> 
> I'm coding some perl to make it look something like this:
> 
> --------- begin snippet ---------
> <html>
> <head>
> <title>We've Lied to You…</title>
> 
> <meta name="generator" content="Modular DocBook HTML Stylesheet Version
> 1.79">
> 
> <link rel="HOME" title="Maximum RPM" href="index.html">
> 
> <line rel="UP" title="Using RPM to Verify Installed Packages"
> href="ch-rpm-verify.html">
> 
> <link ....
> --------- end snippet ---------
> 
> I've hit a wall trying to remove all the newlines.  I've tried it
> several ways... here's just one:
> 
> --------- begin snippet ---------
> while (<$in>)
> {
>     s/<(\w*\W)/<\L$1/g;		# Downcase XXX in "<XXX".
>     s/<\/(\w*\W)/<\/\L$1/g;	# Downcase XXX in "</XXX".
>     if(/^>/)			# if this line starts with '>'
>     {				# then
> 	$curr = tell $in;	# Note current file position,
> 	seek $in, $prev, 0;	# go back to previous line,
> 	chomp;			# remove its trailing newline char,
> 	seek $in, $curr, 0;	# and reset position to current line.
>     }
>     else
>     {
> 	$curr = tell $in;	# Note current file position,
> 	seek $in, $prev, 0;	# go back to previous line
> 	s/\n/ /; 		# Append a space,
> 	chop;			# and then chomp.
> 	seek $in, $curr, 0;	# and reset position to current line.
>     }
>     print;
>     print $out;
>     $prev = tell $in;		# Location of previous line.
> }
> --------- end snippet ---------
> 
> When I cat the output file, it looks like this:
> 
> --------- begin snippet ---------
> GLOB(0x9fd587c)<htmlGLOB(0x9fd587c)><headGLOB(0x9fd587c)><titleGLOB(0x9fd587c)>We've
> Lied to
> You…</titleGLOB(0x9fd587c)><metaGLOB(0x9fd587c)NAME="GENERATOR"GLOB(0x9fd587c)CONTENT="Modular
> DocBook HTML Stylesheet Version
> 1.79"><linkGLOB(0x9fd587c)REL="HOME"GLOB(0x9fd587c)TITLE="Maximum
> RPM"GLOB(0x9fd587c)HREF="index.html"><linkGLOB(0x9fd587c)REL="UP"GLOB(0x9fd587c)TITLE="Using
> RPM to Verify Installed
> Packages"GLOB(0x9fd587c)HREF="ch-rpm-verify.html"><linkGLOB(0x9fd587c)....
> --------- end snippet ---------
> 
> The output I should say *is* all on one line, not line-wrapped the way
> you see it above.  I have a hunch as to why there are the
> "GLOB(0x9fd587c)" thingies everywhere the newlines or spaces (' ')
> should be.  If some expert here could explain them, that would be really
> good.  More importantly though would be some instruction as to how to
> remove the newlines without creating all the GLOB(...) garbage.  Might I
> have to rewrite the script so to open the file in binary mode... or what?
> 
> 
> Maximum thanks for your assistance.
> 
> 
> 
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