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Top Forums Shell Programming and Scripting remove blank lines and merge lines in shell Post 302502625 by dvah on Tuesday 8th of March 2011 01:06:10 PM
Old 03-08-2011
Quote:
Originally Posted by yinyuemi
Code:
awk '{printf NF?$0:"\n"}'

This really works good, but i cudnt exactly understand the logic behind it. I'm aware NF is for no. of fields in each line and \n is for newline.

But i cudnt understand the whole logic, if u cud explain me, that be really helpful for me to make changes to this in future.

Grateful to your comments.

Many Thanks!

---------- Post updated at 11:36 PM ---------- Previous update was at 11:31 PM ----------

Thanks for all ur comments. It works weel and good.

I just need another help here.

I need to add a extra delimiter at end of each line. I'll go with the same ex that i posted above.

-in format
xx,xx,xx ,xx , , , , ,,xx,xxxx,
xxxx,, ,, xxx,,

yyy,yy,yy, , , ,yyy,yy,,
yyy,yy,,,yyyyy,

....
 

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PROCESSCSV.PY(1)					      Virtualization Support						  PROCESSCSV.PY(1)

NAME
processcsv.py - process virt-top CSV files SUMMARY
virt-top --csv data.csv processcsv.py < data.csv DESCRIPTION
virt-top is a top(1)-like utility for showing stats of virtualized domains. processcsv.py is a simple Python script that post-processes the output of "virt-top --csv". It is used like this: virt-top --csv data.csv processcsv.py < data.csv The second command will overwrite the following files in the current directory: "global.csv" This contains the global (host) statistics columns from the CSV file. "domainNN.csv" (multiple files) For each libvirt domain ID NN, a file is created containing the per-domain statistics from the CSV file. SEE ALSO
virt-top(1) AUTHORS
Richard W.M. Jones <rjones @ redhat . com> COPYRIGHT
(C) Copyright 2007-2012 Red Hat Inc., Richard W.M. Jones http://libvirt.org/ This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. virt-top-1.0.8 2013-12-29 PROCESSCSV.PY(1)
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