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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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CHROOT(8)						    BSD System Manager's Manual 						 CHROOT(8)

NAME
chroot -- change root directory SYNOPSIS
chroot [-u -user] [-g -group] [-G -group,group,...] newroot [command] DESCRIPTION
The chroot utility changes its current and root directories to the supplied directory newroot and then exec's command, if supplied, or an interactive copy of the user's login shell. If the -u, -g or -G options are given, the user, group and group list of the process are set to these values after the chroot has taken place. See setgid(2), setgroups(2), setuid(2), getgrnam(3) and getpwnam(3). Note, command or the shell are run as your real-user-id. ENVIRONMENT
The following environment variable is referenced by : SHELL If set, the string specified by SHELL is interpreted as the name of the shell to exec. If the variable SHELL is not set, /bin/sh is used. SEE ALSO
chdir(2), chroot(2), environ(7), jail(8) HISTORY
The chroot utility first appeared in 4.4BSD. SECURITY CONSIDERATIONS
chroot should never be installed setuid root, as it would then be possible to exploit the program to gain root privileges. BSD
January 24, 2002 BSD
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