hi all
i'm in trouble now. help me please.
the program is like below:
system( "tar cvf p.tar /data" );
excute this program and the p.tar is empty .
when i run this command in command line , p.tar is right.
so why?
please tell me , thank you .

Hi!

What flavor of UNIX are you using? See the man pages on the native system on tar

Regards
SHAIK

the environment is SCO UNIX

how about harcoding the exact path to each file in your system() command, which should look like:

system("/sbin/tar cvf /users/shaik/p.tar /data");

And notic what the prompt says when the system() is being executed.

Rgds
SHAIK

yeah , i have try by that way .
but not effection.
i have found a way to solve this problem .
the modified program like bleow:

echo " #!/bin/ksh \n tar cvf p.tar /data > tar.sh";
system("tar.sh");

but i still do not know why?

Hi!

Good you solved the problem. Probably some other version or program called tar is getting executed. Check your $PATH variable, in one of which path, there should be another tar located.

Rgds
SHAIK