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Returning a value from one perl to another
2

Returning a value from one perl to another

Returning a value from one perl to another

(OP)
Hi,

Supposing that perl code A calls up perl code B to do a check before continuing it's own execution, i have two questions:

1. How do I call perl code B from A? Using system()?
2. How do I return the answer from B to A? Writing to file?

Thanks

RE: Returning a value from one perl to another

you can call a perl script using system in the same way you'd call the same script from the command line

system() returns a value from the program it runs - you return a value from a perl script with the exit function

exit 2

for example

Mike
Mike_Lacey@Cargill.Com
Cargill's Corporate Web Site
Please don't send me email questions without posting them in Tek-Tips as well. Better yet -- Post the question in Tek-Tips and send me a note saying "Have a look at so-and-so in the thingy forum would you?"

RE: Returning a value from one perl to another

additionally, system returns a status, not data from code B.  If you want to catch data printed from B to A, you could use backticks or you could fork code B as a child process using or fork.
The backtick approach might look like this.....
Code A runs code B via the backticks and catches prints from code B.

Code A:
#!/usr/local/bin/perl
$stuff = `codeB startedInCodeA`;                   # run codeB and catch output of B
print "In codeA, codeB returned - $stuff.\n";

Code B:
#!/usr/local/bin/perl
$var = @ARGV[0];                                      # first command line arg
print "$var";                                                 # print var to STDOUT which goes
                                                                 # back to the parent process, codeA.


Forks are a little more complicated........ask if the above does not help.

Good Luck......

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