如何从crontab执行的perl脚本中执行的可执行文件（cap）捕获STDOUT

Question

Whew that is a long-winded title. But it explains my issue:

I have a crontab that runs a perl script.

That perl script runs a cap task, which outputs to STDOUT some status messages.

The perl script is supposed to capture the STDOUT (currently using backticks) from cap and parse it.

Now, this works 100% fine when I run the script from a bash user. However, when I run the script from a crontab, the perl script doesn't capture any output from the cap task.

Has anyone dealt with anything like this before? Thanks.

Answer 1

Maybe your cap executables are died without emitting any message to stdout. Did you checking the success state of execution?

Could you tried this?

$check_result = `$cmd 2>&1`;
if ($?){
  die "$cmd failed with $check_result, $!";    
}