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A quick Mac OSX question

Albert Schlef

1/9/2009 11:11:00 AM

Does mac osx supports the "2>&1" syntax to redirect stderr?

In other words, does the following line of code work as expected in mac
osx?

output = `some_command 2>&1`
--
Posted via http://www.ruby-....
2 Answers

Mike Stok

1/9/2009 11:24:00 AM

0


On Jan 9, 2009, at 6:11 AM, Albert Schlef wrote:

> Does mac osx supports the "2>&1" syntax to redirect stderr?
>
> In other words, does the following line of code work as expected in
> mac
> osx?
>
> output = `some_command 2>&1`
> --
> Posted via http://www.ruby-....

Yes:

ratdog:~ mike$ uname -a
Darwin ratdog.local 9.6.0 Darwin Kernel Version 9.6.0: Mon Nov 24
17:37:00 PST 2008; root:xnu-1228.9.59~1/RELEASE_I386 i386
ratdog:~ mike$ irb
>> output = `perl -e 'die "Aaargh!"'`
Aaargh! at -e line 1.
=> ""
>> output = `perl -e 'die "Aaargh!"' 2>&1`
=> "Aaargh! at -e line 1.\n"


--

Mike Stok <mike@stok.ca>
http://www.stok...

The "`Stok' disclaimers" apply.

pjb

1/9/2009 12:28:00 PM

0

Albert Schlef <albertschlef@gmail.com> writes:

> Does mac osx supports the "2>&1" syntax to redirect stderr?
>
> In other words, does the following line of code work as expected in mac
> osx?
>
> output = `some_command 2>&1`

As long as you use bash instead of tcsh, yes.

bash -c ' output = `some_command 2>&1` ; echo "$output" '

Notice than nowdays we can use $(some_command 2>&1) instead of the
backquotes, which is nice because you can nest them:

bash -c ' msg=$(printf "%dnd result = %s" $(( 1 * 2 * 3 * 7 )) "$(echo "Do not panic")" ) ; echo "$msg" '
42nd result = Do not panic


Or use chsh to switch to bash:
http://www.macshadows.com/kb/index.php?title=Changing_your_shell_o...

--
__Pascal Bourguignon__