[olug] Unix Tip: I SED BLANK

[Jeremy Bettis]

Who signed olug up for this unix tip mailing list?  I find it annoying.
If you like it so much sign up your own email, not olug at olug.org.

--
Jeremy Bettis, Software Development Manager
HKS Medical Information Systems, Inc.
jeremyb at hksys.com


> -----Original Message-----
> From: Unix Guru Universe [mailto:listserv at ugu.com]
> Sent: Tuesday, February 18, 2003 1:22 PM
> To: olug at olug.org
> Subject: [olug] Unix Tip: I SED BLANK
> 
> 
> =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
> 
> 			      UNIX GURU UNIVERSE
> 			         UNIX HOT TIP
> 
> 			Unix Tip 1875 - February 18, 2003
> 
> 		    http://www.ugu.com/sui/ugu/show?tip.today
> 
> =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
> 
> 
> I SED BLANK
> 
> Using sed, you can remove blank lines, and
> lines that contain only whitespace, from a
> file using the following:
> 
> sed -e '/^[     ]*$/d' InputFile >OutputFile
> 
> Within the single quotes ('), the forward
> slashes (/) delimit the regular expression
> that will be interpreted by sed.  The "d"
> before the closing single quote, tells sed
> to delete any lines that match the regular
> expression.
> 
> Within the regular expression, the caret
> (^) matches the beginning of a line.
> The []* matches zero to many occurrences of
> the character list between the open bracket
> ([) and the close bracket (]) (in the above
> regular expression, you must insert a space
> and a tab between the brackets).  The dollar
> sign ($) matches the end of a line.
> 
> These three constructs together match any
> blank line or any line that contains only
> spaces and tabs (in any combination).
> 
> Since the standard operation of sed is to
> echo lines to stdout, all lines except blank
> lines (or lines that only contain whitespace)
> will be sent to OutputFile.
> 
> 
> This tip generously supported by: tim.couger at wcom.com
> 
> 
> 
>
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