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Full Discussion: How to run unix commands in a new shell inside a shell script?
Top Forums Shell Programming and Scripting How to run unix commands in a new shell inside a shell script? Post 94681 by hkapil on Tuesday 3rd of January 2006 04:30:27 AM
Old 01-03-2006
How to run unix commands in a new shell inside a shell script?
Hi ,
I am having one situation in which I need to run some simple unix commands after doing "chroot" command in a shell script. Which in turn creates a new shell.

So scenario is that
- I need to have one shell script which is ran as a part of crontab
- in this shell script I need to do a "chroot" to some particular directory .
- After chroot I need to run some unix command.

Here is the script
*****************************************
#!/usr/bin/ksh
cd /safedir/rdns/opt/MKDownload
#java MKProcessor

Val=`diff /safedir/rdns/opt/MKDownload/sun.csv
/safedir/rdns/opt/RDNS1.1/WEB-INF/lib/sun.csv |wc
-l`

if [ $Val -gt 0 ];
then
(
# `mv /safedir/rdns/opt/RDNS1.1/WEB-INF/lib/sun.csv
/safedir/rdns/opt/RDNS1.1/WEB-INF/lib/sun.csv.bak`

# `cp /safedir/rdns/opt/MKDownload/sun.csv
/safedir/rdns/opt/RDNS1.1/WEB-INF/lib`

/usr/sbin/chroot /safedir/rdns /bin/sh ------------------1
echo `pwd` -------------------------------------- 2
cd /opt/iws61/https-rdns/
./stop
./start
)
fi

*****************************************

So as apparent from script , after chrooting in line 1 , it creates a new shell and the execution of this script suspends there.
As soon as I 'exit' the shell the remaining commands from line 2 onwards execute in current shell and I get error. But as per my requirement the remaining commands need to run from chrooted directory only i.e new shell created as a result of command at line 1.


Please provide any insight how to solve this ?

Thanks in advance
HKapil
 

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LEARN ABOUT DEBIAN

gpt_build_config

GPT_BUILD_CONFIG(8)					User Contributed Perl Documentation				       GPT_BUILD_CONFIG(8)

NAME

       gpt_build_config - Returns a minimized list of ldflags from a list of globus packages and external libraries.

SYNOPSIS

       gpt_build_config -src <source metadata file> -f <globus_flavor_name> -link [static|shared]

DESCRIPTION

       gpt_build_config creates a file in it's current directory named gpt_build_temp.sh that contains a list of necessary flags assembled from
       the build environment metadata of the packages on which the source metadata depends.  This scanning is done recursively to cover the entire
       dependency tree.  This script was initially inspired by the shell script gnome_config.

LINK ORDER

       The flag list returned by gpt_build_config is assembled in dependent order.  A dependency between two libraries occurs when one library
       needs the symbols of another library in order to link correctly.  For most linkers the library providing the symbols has to be linked after
       the library that needs the symbols.  For example, from the line:

	  -L/opt/Xpm/lib -lXpm -L/usr/lib/X11 -lXm -lX

       gpt_build_config assumes that the library Xpm is dependent on Xm which in turn is dependent on X.  In addition, gpt_build_config assumes
       that Xpm is located in /opt/Xpm/lib and Xm and X are both located in /usr/lib/X11.

BUGS

       Circular dependencies between libraries are not supported.

AUTHOR

       Michael Bletzinger <mbletzin.ncsa.uiuc.edu> and Eric Blau <eblau.ncsa.uiuc.edu>

perl v5.14.2							    2012-04-30						       GPT_BUILD_CONFIG(8)
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