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Full Discussion: Repetitive Tasks: using if..then inside a loop
Top Forums Shell Programming and Scripting Repetitive Tasks: using if..then inside a loop Post 101566 by garak on Thursday 9th of March 2006 05:24:41 PM
Old 03-09-2006
Repetitive Tasks: using if..then inside a loop


I thought I was getting pretty good with Bash but this problem is stumping me. Any suggestions would be greatly appreciated. I've written a firewall script that uses a lot of functions. The variables are read into the script from another .conf file earlier on in the code. Most of these variables are either set as "ON", "OFF", or as an IP address. To date, I've written out a conditional statement for each service. Here is an example of two of them:


if [ $FTP = "ON" ]; then
FTP_WAN
else
if [ "$FTP" != "OFF" ]; then
FTP_PORT_FORWARDING
fi
fi

if [ $SSH = "ON" ]; then
SSH_WAN
else
if [ "$SSH" != "OFF" ]; then
SSH_PORT_FORWARDING
fi
fi


I'd like to figure out a way to make one conditional statement inside a loop where the $SSH or $FTP variables are replaced for each variable corresponding to a service.

I'd thought something like:


$SERVICES=SSH,FTP

for VAR in $SERVICES; do

if [ $VAR = "ON" ]; then
$VAR_WAN
else
if [ "$VAR" != "OFF" ]; then
$VAR_PORT_FORWARDING
fi
fi

done


But no variation I've tried seems to work. I want it to
input the variable, like SSH, and then read the value
of SSH inside the conditional statement. Am I missing
some brackets somewhere or anything else?

Thanks.
 

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LEARN ABOUT LINUX

ipfilter.conf

NETSCRIPT-2.2.conf(5)						File Formats Manual					     NETSCRIPT-2.2.conf(5)

NAME

       /etc/netscript/network.conf - interface, firewalling, and QoS configuration file.

       /etc/netscript/if.conf - interface setup shell script file

       /etc/netscript/qos.conf - QoS setup shell script file

       /etc/netscript/ipfilter.conf - IP chains filtering shell script file

       /etc/netscript/srvfilter.conf - server IP filter shell script file

DESCRIPTION

       This manpage is a place holder until something better is written when the netscript itself has stopped changing rapidly.

       Please  see  the README file in the /etc/netscript directory, and READ the configuration files if you need to change them.  Apart from net-
       work.conf, all of them contain sh (1) shell script functions which are there so that various things can be altered  or  hooked  in  at  the
       right place. Network.conf contains the full network setup details, including special interface setup for the likes of ciped/pppd/wanconfig,
       and is fully commented with examples given.

UPGRADE PATH FROM KERNEL 2.2.X
       The firewall/IP filtering stuff in ipfilter.conf is the part that changed radically with the move to iptables and a far better way of  set-
       ting  up  the  IP filtering rules, however the QoS and interface startup/shutdown in if.conf have changed but are backwards compatible with
       the old 2.2.x ipchains version of netscript for the interface address configuration settings.  You will have to set up the filtering  again
       to use iptables by directly using the iptables commands.

       Also,  the  kernel  2.2.x version scripts are set up so that iptables is only run on a 2.4.x kernel, otherwise IP forwarding is disabled if
       beforehand you set IPFWDING_KERNEL to FILTER_ON in network.conf.

       This means that when you upgrade a box to a 2.4.x router kernel, you should then be able to reboot it and log  into  remotely  and  upgrade
       netscript  to  the version that will support 2.4.x.  In this situation, if you have set old IPFWDING_KERNEL setting to FILTER_ON beforehand
       in network.conf, all IP forwarding through the box will also be disabled.  This means that you can safely remotely upgrade a firewall.

SEE ALSO

       netscript(8), ipchains(8), iproute(8), brcfg(8).

AUTHOR

       This manual page was written by Matthew Grant <grantma@anathoth.gen.nz>, for the Debian GNU/Linux system (but may be used by others).

BUGS

       The author is lazy.  He needs to write btter man pages...

								 November 23, 2000					     NETSCRIPT-2.2.conf(5)
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