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Linux determines the executable search path with the in C.

My OS is Oracle Linux Server release 6.4 (Red Hat Enterprise Linux Server release 6.4 (Santiago).

I already have the below environment variables defined in I get it now, you are changing PATH based on JAVA_HOME earlier - so the variable is substituted in the PATH already. To change PATH - you have to write the PATH setting line again in your script after changing the JAVA_HOMEAmit is on the right path; your /etc/bashrc sets PATH by interpreting $JAVA_HOME's value at that moment.

It does not get re-interpreted if JAVA_HOME changes later.

Now i can't chnage the long running script so is there any way that i can have cron job or anything else which can update the environment variables in the shell where long script is running There may be a solution: Are you able to modify any of the binaries / scripts that the long running script is calling?To make it effective all the way down the call chain, you must follow the setting of the environment variable with an export command. What that means is you can modify the path by appending or prepending the desired directory(s) in existing statements modifying the path. there is nothing to do with Shebang in this case since you are sourcing the script.How do I set the environment variable and have it stay in effect after the script finished?Thanks$ csh % echo $LD_LIBRARY_PATH /opt/oracle/product/8.1.7/lib:/opt/sybase/ASE1200/OCS-12_0/lib/ % setenv LD_LIBRARY_PATH /tmp:$LD_LIBRARY_PATH % echo $LD_LIBRARY_PATH /tmp:/opt/oracle/product/8.1.7/lib:/opt/sybase/ASE1200/OCS-12_0/lib/ % % % echo 'setenv LD_LIBRARY_PATH /tmp:$LD_LIBRARY_PATH' If you don't source the script then the script would be executed in a different shell (sub shell) which has nothing to do with the parent shell.

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OS X ships with an outdated version of Bash as its default shell.