Finding path to source executed shell script

Hello,
I have shell script A which executes shell script B. The scripts A and B reside in the same directory.
Following requirements:
Scripts A and B need to be source executed.
The directory where A and B resides should be anywhere.
The present working directory from where A is executed should be anywhere.
The directory of scripts A and B may not be defined in $PATH.
The current shell could be any Bourne or Korn shell, Linux or Unix.
Problem:
Let's assume scripts A and B are installed in "/custom".
The users working directory is /home/oracle and he executes "source /custom/A".
If script A executes "source ./B", the result would be "source /home/oracle/B", which will fail.
Possible Solution:
Since script A is being sourced, $0 will always be the name of the current shell and not the name and path to script A.
I have not found a universal solution to locate the absolute path of a shell script that is being source executed.
So I was wondering about defining a variable in script A. e.g. SCRIPT_HOME=./custom. When script A executes "source $SCRIPT_HOME/B" it will work, but then script A needs to be customized by the user.
I could write a script C that edits script A to search and edit the SCRIPT_HOME variable. For this to work I will have to verify that script C is not source executed, and that script A is in the same directory as C based on $0. This is not a problem..
The question however is whether I need to create script C, or could simply execute script A with -config argument to edit itself and exit. I would prefer the later case and from what I understand, Unix and Linux do not lock files by default and this should be possible.
Any comments or suggestions please?
Thanks!
Edited by: Dude on Apr 5, 2011 3:59 AM

The $_ solution is actually very simple:
$ cat thatsme
mypath=$(dirname $_)
echo "$mypath/B"
$ source /home/oracle/thatsme
/home/oracle/BI do not need the absolute path of script A. The relative path from my current directory will do as well.
But, it does not work with an alias:
$ alias thatsme='source /home/oracle/thatsme'
$ thatsme
./B

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Regards

How to set the time limit to execute shell script

I am using Runtime exec() method to execute a shell script
if the script hangs for long time infinitely then how to get the control
return to the program.
Thanks in advance

rmi_rajkumar wrote:
let me explain with an example
script name is test.sh
Runtime.exec("test.sh") this will start a new process
if (proc.waitFor() == 0) {
try {
InputStreamReader isr = new InputStreamReader(proc.getInputStream());
BufferedReader br = new BufferedReader(isr);
String line;
while ((line = br.readLine()) != null) {
outputBuf.append(line).append(ConfigOptions.getLineModeStr());
} catch (IOException ioe) {
if test.sh did not exit and hangs with no response
in this case proc.waitFor() will not execute try catch the control will remain if statement
my question is insteadof waiting indefinitely need to set a time out say 1 hour and kill the process that executed the scriptYou really need to read the article in the link given by another poster. Your code will not work correctly because you are waiting for the process to end before reading the stream and the processes may never end because you are not reading the stream until after it ends (you need to use muli-threading as explained in the article). If the process really did hange you could probably use destroy(); but, for now, the real problem is your code.

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