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Full Discussion: Read contents from a file
Top Forums Shell Programming and Scripting Read contents from a file Post 302477647 by Scrutinizer on Monday 6th of December 2010 04:41:23 AM
Old 12-06-2010
Through subshell and external commands:
Code:
vtgrp=$(awk -F: '$1==h{print $2}' h=$hostname "$LOOKUP")

Code:
vtgrp=$(sed -n "/^$hostname:/s/.*://p" "$LOOKUP")

Trhrough external commands and pipe
Code:
vtgrp=$(grep "^$hostname:" "$LOOKUP" | cut -d: -f2)

Through shell builtin read command
Code:
while IFS=: read h v
do 
  if [ "$h" = "$hostname" ]; then
    vtgrp=$v
  fi
done < "$LOOKUP"

 

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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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