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Shell Programming and Scripting

Why variables are not charged ?

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

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:

~/toto.sh

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

christian
# 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.

https://secure.wikimedia.org/wikiped...Dot_%28Unix%29

Gary
# 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

regards
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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