Backtick commands and stderr

Ruby
1

Hi!

When executing a system op using the backtick method, the standard
output is caught and returned in the assigned variable:

output= ls -Al

I am wondering what happens with the standard error output? I have
written a script that executes well in the happy path scenario, but
for the case where the invoked system tool is writting to stderr I
have no idea how to trap that.

Any help and ideas are highly appreciated,

./alex

2

On 10/26/06, Alexandru P. [email protected]
wrote:

have no idea how to trap that.

Any help and ideas are highly appreciated,

Since it’s a system command, you can ask it to redirect stderr to
stdout:

output = ls -Al 2>&1

3

On 10/27/06, Wilson B. [email protected] wrote:

for the case where the invoked system tool is writting to stderr I
have no idea how to trap that.

Any help and ideas are highly appreciated,

Since it’s a system command, you can ask it to redirect stderr to stdout:

output = ls -Al 2>&1

That was it! Great!

./alex

.w( the_mindstorm )p.

4

Which shell is ruby using?
Can I control which shell ruby is using?

-Dan

5

On Fri, 27 Oct 2006, Dan B. wrote:

Which shell is ruby using?
Can I control which shell ruby is using?

man system

(/bin/sh by ISO C/POSIX)

-a