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Full Discussion: Remove string between two special characters
Top Forums Shell Programming and Scripting Remove string between two special characters Post 302552876 by engineermayur on Tuesday 6th of September 2011 01:16:18 AM
Old 09-06-2011
Remove string between two special characters
Hi All,

I have a variable like
Code:
AVAIL="\
BACK:bkpstg:testdb3.iad.expertcity.com:backtest|\
#AUTH:authstg:testdb3.iad.expertcity.com:authiapd|\
TEST:authstg:testdb3.iad.expertcity.com:authiapd|\
"

What I want to do here is that If a find # before any entry, remove the entire string between # and first | (including # and |). SO the resulting string would be like -
Code:
AVAIL="\
BACK:bkpstg:testdb3.iad.expertcity.com:backtest|\
TEST:authstg:testdb3.iad.expertcity.com:authiapd|\
"

With the help of this forum itself, I found the solution as below -
Code:
echo "${AVAIL}" | sed -e "s/#[^|]*|//g"

But I am not able to exactly understand how above is working. My initial understanding was that #[^|]*| deletes all entries encapsulated between # and first pipe except the ones encapsulated between two pipes but that doesn't seem to explain above transalation. I have played a good amount with sed but this one seems to be tough to understand.

Can anybody please help understand the functioning of above sed trick ?

Thanks
Last edited by Franklin52; 09-06-2011 at 03:04 AM.. Reason: Please use code tags for code and data samples, thank you
 

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LEARN ABOUT CENTOS

paps

PAPS(1) 						      General Commands Manual							   PAPS(1)

NAME

       paps - UTF-8 to PostScript converter using Pango

SYNOPSIS

       paps [options] files...

DESCRIPTION

       paps reads a UTF-8 encoded file and generates a PostScript language rendering of the file. The rendering is done by creating outline curves
       through the pango ft2 backend.

OPTIONS

       These programs follow the usual GNU command line syntax, with long options starting with  two  dashes  (`-').   A  summary  of  options	is
       included below.

       --landscape
	      Landscape output. Default is portrait.

       --columns=cl
	      Number of columns output. Default is 1.

       --font=desc
	      Set the font description. Default is Monospace 12.

       --rtl  Do rtl layout.

       --paper ps
	      Choose paper size. Known paper sizes are legal, letter, a4. Default is A4.

       --bottom-margin=bm
	      Set bottom margin in postscript points (1/72 inch). Default is 36.

       --top-margin=tm
	      Set top margin. Default is 36.

       --left-margin=lm
	      Set left margin. Default is 36.

       --right-margin=rm
	      Set right margin. Default is 36.

       --help Show summary of options.

       --header
	      Draw page header for each page.

       --markup
	      Interpret the text as pango markup.

       --encoding=ENCODING
	      Assume the documentation encoding is ENCODING.

       --lpi  Set the lines per inch. This determines the line spacing.

       --cpi  Set the characters per inch. This is an alternative method of specifying the font size.

       --stretch-chars
	      Indicates  that  characters  should be stretched in the y-direction to fill up their vertical space. This is similar to the texttops
	      behaviour.

AUTHOR

       paps was written by Dov Grobgeld <dov.grobgeld@gmail.com>.

       This manual page was written by Lior Kaplan <kaplan@debian.org>, for the Debian project (but may be used by others).

								  April  17, 2006							   PAPS(1)
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