Why variables are not charged ?

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# 1  
Old 07-26-2011
Why variables are not charged ?


under a linux platform at the open session time , the ".bash_profile" is ran

In this ".bash_profile" , i run a script "toto.sh"

if the script is run as:


the values charged ( like PS1 ) and the alias are not kept in the session

if i run as :
. ~/toto.sh

all is ok

Can you explain what is the role of the point ?

thanks in advance

# 2  
Old 07-26-2011
In the first example, the command is being run in a subshell and thus the variables it is changing are not preserved when you return.

Using the dot command however, runs the program in the current shell, thus preserving your settings.


# 3  
Old 07-26-2011
If you execute a script using ". space script_name" it will be executed in current shell and hence all the aliases/variables defined will be avaiable outside.

How ever, if you run a script as "script_name" it will be executed in a child shell and the same won't be available to outer. I believe you have to use "export" if you wish to make them available outside too.
# 4  
Old 07-26-2011
Thanks for your help

even if i add EXPORT, the values are not kept

Christian Smilie
# 5  
Old 07-26-2011
Check these:

4 Ways of Executing a Shell Script in UNIX / Linux (link removed)

Bourne Shell Tutorial
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