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Old 09-27-2007, 10:21 AM   #1
daYz
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How to pass a c variable to a bash script?


Hi,

I want to pass a variable from a c program to a bash script. Can someone tell me how that can be done, or refer me to more information?

Thanks
 
Old 09-27-2007, 01:49 PM   #2
daYz
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To be more specific, in c you can "pass" a variable to another file by using the extern specifier. I wonder how a variable in a c file can be seen from within another file that is a bash script.

Thanks
 
Old 09-27-2007, 03:25 PM   #3
osor
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Quote:
Originally Posted by daYz View Post
To be more specific, in c you can "pass" a variable to another file by using the extern specifier. I wonder how a variable in a c file can be seen from within another file that is a bash script.
Well, extern is a specifier telling the linker that a symbol exists in an object file different from the one you compiled with your original source file. Since, a script is not compiled into object code, there is no way to do what you describe (tell a script to look for symbols elsewhere).

There are, however, a few remedies when you have a C program calling a bash script (e.g., using the exec family of functions).
  1. You might pass the variable(s) to bash as command-line parameters. You can then access the positional parameters as $1, $2, $3, etc.
  2. You can pass the variable(s) to bash as environment variables. That way, you can access the variables in the script using whatever identifiers you chose in the C program.
 
Old 09-28-2007, 08:30 AM   #4
daYz
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That is exactly what I needed to know. Thanks osor
 
  


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