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How can I make variables “exported” in a bash script stick around?

I have a problem with executing script from file. When I type in command line

PATH=$PATH:/home/

then PATH is changed appropriately. But when I execute this file :

#!/bin/sh
#provided by me

PATH=$PATH:/home/
echo "done"
exit 0

done is printed but PATH is not changed. Why is this happening ?

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Patryk
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1 Answers1

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Environmental variable changes apply to the current process and any subsequent children, but not to parent processes. So if you run a script, it cannot affect the environmental variables of the shell that ran it. You need to source the script using the . shell builtin. I.e.

. /path/to/script

This causes the current shell to execute the commands in the file instead of running a subprocess.

Kyle Jones
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  • Can you tell me exactly how should I do this since now I am writing my script, putting it in `/etc/init.d/` and running `update-rc.d myScriptName defaults`. Or in other words: is there better way to permanently change `$PATH` ? – Patryk Feb 21 '12 at 00:19
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    Set PATH in /etc/profile. This will affect sh, ksh and bash users. /etc/zprofile is the file to use for zsh users. – Kyle Jones Feb 21 '12 at 00:41
  • I have tried `source` and `.` but it logs me off from chell. Why is this happening ? – Patryk Feb 21 '12 at 13:09
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    Remove the `exit 0` from the script. It is telling your shell to exit, which is not what you want. – Kyle Jones Feb 21 '12 at 17:29