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Full Discussion: Shell Scripting Error - help
Top Forums Shell Programming and Scripting Shell Scripting Error - help Post 302704725 by jim mcnamara on Saturday 22nd of September 2012 11:37:26 PM
Old 09-23-2012
Odd construct that. How about a here doc?

Code:
fdisk $RESET_HDD <<EOF  > $TMPFILE2 2>&1
p
q
EOF

I don't think there should be an extra newline there. which the shell script could insert. I may be wrong. Can you run fdisk with the value of $RESET_HDD manually, emulating what the code is trying to do: enter a p and enter a q

If you can decide what $TMPFILE2 and $TMPFILE1 translate to, try
Code:
cat $TMPFILE1
cat $TMPFILE2

This will tell you if you got a straight p and q. Some versions of echo do NOT by default decode \n into a newline. You may be getting garbage like "pn". fdisk will produce an error as well that you can see.

What the script code is doing is running the fdisk program "interactively" with canned responses. A more reasonable approach is a here doc, as above.

Do you have nonstandard aliases or symlinks for the shells - /bin/bash especially? what does the output of
Code:
type echo

give? It should be "echo is a shell builtin". The "real" bash echo will ignore those \n characters. Otherwise you may get garbage in $TMPFILE1

Code:
type echo
echo is a shell builtin
echo "p\n"> file
echo "q\n" >> file
cat file

gives
Code:
p
q

NO extra newline characters or garbage extraneous characters.
Last edited by jim mcnamara; 09-23-2012 at 12:57 AM..
 

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LEARN ABOUT OPENSOLARIS

if.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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