SED- Insert text at top of file Post: 23973

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Top Forums Shell Programming and Scripting SED- Insert text at top of file Post 23973 by Perderabo on Wednesday 3rd of July 2002 09:48:12 AM

07-03-2002

Administrator Emeritus

Quote:

Originally posted by peter.herlihy
So Both actually acheive teh same result now..although I coulnn't explain why mine does!

Well then, I'll take a crack at explaining your solution to you.

Inside single quotes, what you see is what you get. No character has any special meaning inside single quotes. So variables won't expand. A string like:
'$a'
will just be $a. The shell will not try to substitute the value of a variable called a. So in the line:
sed '$a\
we get exactly what we ask for. Inside single quotes, even the backslash is just another character. (And, btw, this means that there is no way to get a single quote inside single quotes...so 'you can't do that' won't work and there is no way to fix it with backslashes.)

When you want to use a variable inside single quotes, it won't work:
'something $var something'
isn't going to do it. So we must break that single quoted string into two single quoted string and put the variable between them:
'something '$var' something'
is actually good enough, but most folks will add {} whenever a variable touches non-blanks, not just other letters:
'something '${var}' something'

And finally, if the value of var has a string of blanks, we would need to protect them, so we would need single quotes around the variable:
'something '"${var}"' something'
And this get us to the syntax that you used. Your first single quoted string started on one line and finished on the next but otherwise it's pretty much what we have here.

Perderabo

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LEARN ABOUT SUSE

gtk2::cellrendererprogress

Gtk2::CellRendererProgress(3)				User Contributed Perl Documentation			     Gtk2::CellRendererProgress(3)

NAME

       Gtk2::CellRendererProgress

HIERARCHY

	 Glib::Object
	 +----Glib::InitiallyUnowned
	      +----Gtk2::Object
		   +----Gtk2::CellRenderer
			+----Gtk2::CellRendererProgress

METHODS

   cellrenderer = Gtk2::CellRendererProgress->new
PROPERTIES

       'orientation' (Gtk2::ProgressBarOrientation : readable / writable / private)
	   Orientation and growth direction of the progress bar

       'pulse' (integer : readable / writable / private)
	   Set this to positive values to indicate that some progress is made, but you don't know how much.

       'text' (string : readable / writable / private)
	   Text on the progress bar

       'text-xalign' (Glib::Float : readable / writable / private)
	   The horizontal text alignment, from 0 (left) to 1 (right). Reversed for RTL layouts.

       'text-yalign' (Glib::Float : readable / writable / private)
	   The vertical text alignment, from 0 (top) to 1 (bottom).

       'value' (integer : readable / writable / private)
	   Value of the progress bar

ENUMS AND FLAGS

   enum Gtk2::ProgressBarOrientation
       o   'left-to-right' / 'GTK_PROGRESS_LEFT_TO_RIGHT'

       o   'right-to-left' / 'GTK_PROGRESS_RIGHT_TO_LEFT'

       o   'bottom-to-top' / 'GTK_PROGRESS_BOTTOM_TO_TOP'

       o   'top-to-bottom' / 'GTK_PROGRESS_TOP_TO_BOTTOM'

SEE ALSO

       Gtk2, Glib::Object, Glib::InitiallyUnowned, Gtk2::Object, Gtk2::CellRenderer

COPYRIGHT

       Copyright (C) 2003-2008 by the gtk2-perl team.

       This software is licensed under the LGPL.  See Gtk2 for a full notice.

perl v5.12.1							    2010-07-05					     Gtk2::CellRendererProgress(3)

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