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Top Forums Shell Programming and Scripting Preserving values with for loop for later use Post 302740101 by Corona688 on Wednesday 5th of December 2012 02:00:13 PM
Old 12-05-2012
That would be ugly, glitch-prone, and a gaping security hole(never use eval), which is why I suggested the alternative.

This could work, if your variables don't have more than one line in them.

Code:
printf "%s\n" "$var1" "$var2" "$var3" > save

for X in var1 var2 var3
do
        read $X
done < save

rm -f save

But again, the best way would be to avoid the problem completely by using a subshell -- that's one reason they exist. Or just don't overwrite those variables in the first place.
 

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uruk-save(8)						      SYSTEM ADMINISTRATION						      uruk-save(8)

  NAME
      uruk-save - save uruk rc configuration in iptables-save-style format

  SYNOPSIS
      uruk-save [-6 (save ip6tables rules)]

  OPTIONS
      -6 (save ip6tables rules)
	Don't save iptables rules but save ip6tables rules, for IPv6 filtering.

  DESCRIPTION
      uruk-save  saves	the  IPv4 rules in /etc/uruk/rc in iptables-save(5)-style format, without invoking iptables(8). If the -6 option is given,
      the IPv6 rules (if any) in /etc/uruk/rc are saved, in ip6tables-save(5)-style format. It	prints	output	to  stdout;  suggested	invocation
      therefore is

       # uruk-save > /var/lib/uruk/iptables/active

      or

       # uruk-save -6 > /var/lib/uruk/ip6tables/active

      .  This script is useful if you don't like the default behaviour of the uruk init script, and would like it to load the current uruk rc file
      instead of the current active file. Please note: generally you don't need to invoke this script manually: the init script which  comes  with
      uruk is suitable for most cases, it invokes uruk-save if needed.

  WARNING
      Just as uruk, in order to keep the uruk-save script small and simple, the script does very little error handling. It does not check the con-
      tents of the rc file in any way before executing it. When your rc file contains bogus stuff, uruk-save will very likely behave in unexpected
      ways. Caveat emptor.

      Things will likely break if you do fancy stuff in an rc hook file. For instance, uruk-save saves the filter table only. If you define mangle
      or nat tables, things will break.

      If your rc file is in verbose mode (i.e. it features set -x) or in no-act mode (i.e. it features iptables='echo iptables'), uruk-save fails.

  SEE ALSO
      uruk(8), uruk-rc(5) .

  COPYRIGHT
      Copyright (C) 2005 Joost van Baal <joostvb-uruk@mdcc.cx>

      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 3 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 MERCHANTABIL-
      ITY 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, see http://www.gnu.org/licenses/.

  AUTHOR
      Joost van Baal <joostvb-uruk@mdcc.cx>

  uruk-save 20120530						      30 mai 2012							uruk-save(8)
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