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to read variable from child script

 
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# 1  
Old 08-19-2009
to read variable from child script
Hi
I have two shell scripts A and B
A calls B
I would like to use a variable in A the value of which is assigned by
B after calling B
Thanks in advance
Suresh
# 2  
Old 08-19-2009
A quick and dirty way would just be to output that variable into a file and have the other shell script read from it. Would have to see some logic flow of your script to tell you more.
# 3  
Old 08-19-2009
Hi Suresh,

Code:
$ cat a.sh
export VAR_A=9
echo In a.sh VAR_A : $VAR_A
./b.sh

$ cat b.sh
echo In b.sh VAR_A : $VAR_A

$ ./a.sh
In a.sh VAR_A : 9
In b.sh VAR_A : 9
$

# 4  
Old 08-20-2009
Hi Thanks for your replies
Chompy.....thank you but this is the way i do but i thought that there might be another smarter way to do it that is why i posted it

scripter.online .........thank you but echo would work but manupulation of the variable doesnt work
# 5  
Old 08-20-2009
Hey I said it was quick and dirty, didn't say I endorsed it Smilie
# 6  
Old 08-20-2009
Quote:
Originally Posted by ssuresh1999
Hi Thanks for your replies
Chompy.....thank you but this is the way i do but i thought that there might be another smarter way to do it that is why i posted it

scripter.online .........thank you but echo would work but manupulation of the variable doesnt work

Hi ,

Please check

Code:
 
$ cat a.sh
export VAR_A=9
echo In a.sh VAR_A : $VAR_A
./b.sh

$ cat b.sh
echo In b.sh VAR_A : $VAR_A
VAR_A=`expr ${VAR_A} + 9 `
echo In b.sh After adding VAR_A to VAR_A : $VAR_A
$

$ ./a.sh
In a.sh VAR_A : 9
In b.sh VAR_A : 9
In b.sh After adding VAR_A to VAR_A : 18
$

Last edited by scripter.online; 08-20-2009 at 07:07 PM..
# 7  
Old 08-21-2009
exporting the variable is the solution as answered by scripter.online. If echo is working and showing correct data, then check you manipulation code.
 
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