backtick commands and stderr

[Alexandru Popescu]

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

 

[Wilson Bilkovich]

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,

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

output = `ls -Al 2>&1`

 

[Alexandru Popescu]

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[/QUOTE]

 

[ara.t.howard]

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

man system

(/bin/sh by ISO C/POSIX)

-a