Opening a UNIX shell in Java

Shell Programming and Scripting
1

Hi,
I need to simulate the machine's native shell (sh), for that I open up a UNIX shell in my Java program.
My code works fine with windows shell ('cmd') but with unix ('sh') I failed to retrieve the machine's prompt.
I believe that the issue is unix-related and that the process I launched has no appropriate environment parameter, so i need the expert's opinion on that :).

These are the environment's variables as printed by the user:

# set
HOME=/
HZ=100
IFS=

LC_COLLATE=en_US.ISO8859-1
LC_CTYPE=en_US.ISO8859-1
LC_MESSAGES=C
LC_MONETARY=en_US.ISO8859-1
LC_NUMERIC=en_US.ISO8859-1
LC_TIME=en_US.ISO8859-1
LOGNAME=root
MAIL=/var/mail/root
MAILCHECK=600
OPTIND=1
PATH=/usr/sbin:/usr/bin
PS1=#
PS2=>
SHELL=/sbin/sh
TERM=ansi
TZ=Israel
_INIT_NET_STRATEGY=none
_INIT_PREV_LEVEL=S
_INIT_RUN_LEVEL=3
_INIT_RUN_NPREV=0
_INIT_UTS_ISA=sparc
_INIT_UTS_MACHINE=sun4u
_INIT_UTS_NODENAME=DEVSSSUN01
_INIT_UTS_PLATFORM=SUNW,Ultra-5_10
_INIT_UTS_RELEASE=5.8
_INIT_UTS_SYSNAME=SunOS
_INIT_UTS_VERSION=Generic_108528-13

The following are the environment's variables as printed by my java app:

_INIT_UTS_VERSION:Generic_108528-13
XFILESEARCHPATH:/usr/dt/app-defaults/%L/Dt
HZ:100
LC_CTYPE:en_US.ISO8859-1
NLSPATH:/usr/dt/lib/nls/msg/%L/%N.cat
LC_COLLATE:en_US.ISO8859-1
HOME:/
_INIT_UTS_ISA:sparc
_INIT_RUN_LEVEL:3
_INIT_UTS_RELEASE:5.8
LC_NUMERIC:en_US.ISO8859-1
LD_LIBRARY_PATH:/usr/java1.5/jre1.5.0_09/lib/sparc/client:/usr/java1.5/jre1.5.0_
09/lib/sparc:/usr/java1.5/jre1.5.0_09/../lib/sparc
SHELL:/sbin/sh
LOGNAME:root
_INIT_UTS_MACHINE:sun4u
_INIT_PREV_LEVEL:S
_INIT_UTS_NODENAME:DEVSSSUN01
LC_MONETARY:en_US.ISO8859-1
_INIT_RUN_NPREV:0
MAIL:/var/mail/root
TZ:Israel
LC_TIME:en_US.ISO8859-1
_INIT_UTS_PLATFORM:SUNW,Ultra-5_10
_INIT_NET_STRATEGY:none
LC_MESSAGES:C
_INIT_UTS_SYSNAME:SunOS
TERM:ansi
PATH:/usr/sbin:/usr/bin

And these are the environment's variables as printed by the user in the shell that was launched by the java app:

HOME=/
HZ=100
IFS=

LC_COLLATE=en_US.ISO8859-1
LC_CTYPE=en_US.ISO8859-1
LC_MESSAGES=C
LC_MONETARY=en_US.ISO8859-1
LC_NUMERIC=en_US.ISO8859-1
LC_TIME=en_US.ISO8859-1
LD_LIBRARY_PATH=/usr/java1.5/jre1.5.0_09/lib/sparc/client:/usr/java1.5/jre1.5.0_
09/lib/sparc:/usr/java1.5/jre1.5.0_09/../lib/sparc
LOGNAME=root
MAIL=/var/mail/root
MAILCHECK=600
NLSPATH=/usr/dt/lib/nls/msg/%L/%N.cat
OPTIND=1
PATH=/usr/sbin:/usr/bin
SHELL=/sbin/sh
TERM=ansi
TZ=Israel
XFILESEARCHPATH=/usr/dt/app-defaults/%L/Dt
_INIT_NET_STRATEGY=none
_INIT_PREV_LEVEL=S
_INIT_RUN_LEVEL=3
_INIT_RUN_NPREV=0
_INIT_UTS_ISA=sparc
_INIT_UTS_MACHINE=sun4u
_INIT_UTS_NODENAME=DEVSSSUN01
_INIT_UTS_PLATFORM=SUNW,Ultra-5_10
_INIT_UTS_RELEASE=5.8
_INIT_UTS_SYSNAME=SunOS
_INIT_UTS_VERSION=Generic_108528-13

Note that there is no prompt's variable (SP1) for the java app and\or the process that was launched by it.

Any idea?
Thanks in advance.
Guy

2

Most likely the shell has determined that it is not connected to a terminal, and hence is "non-interactive", so it does not print the prompts.

3

Can I change the shell's "non-interactive" mode to an "interactive"? Can I "trick" him, or this is it and there is nothing to do? although I believe that it should be a solution.

Thanks