Copy stderr to variable

Scripting Forums AppleScript | Mac OS X
#1

Hi all,

Simple question: I’m using sox to analyze audio files but can’t get the return into a variable.

This works:

 set bob to do shell script "ls"

As does this:

 set bob to do shell script "sox ~/Music/test.aif -n stats >& ~/Music/tmp1.txt; cat ~/Music/tmp1.txt"

But I’d rather not have to use an external file.

This runs, but returns nothing to bob:

 set bob to do shell script "sox ~/Music/test.aif -n stats"
#2

Have you tried:

set bob to do shell script "echo sox ~/Music/test.aif -n stats"
#3

Thanks, I knew it would be simple.

#4

Except that it doesn’t do what I need. Maybe I wasn’t clear with my goal.

set bob to do shell script "echo sox ~/Music/test.aif -n stats"

This sets bob to sox ~/Music/test.aif -n stats. I need to set bob to the stderr that running the sox line returns:

         Overall     Left      Right

DC offset -0.000002 -0.000002 -0.000002
Min level -0.084015 -0.084015 -0.083832
Max level 0.089966 0.079132 0.089966
Pk lev dB -20.92 -21.51 -20.92
RMS lev dB -43.97 -44.38 -43.60
RMS Pk dB -30.95 -32.19 -30.95
RMS Tr dB -87.67 -87.67 -86.96
Crest factor - 13.91 13.62
Flat factor 0.00 0.00 0.00
Pk count 2 2 2
Bit-depth 13/16 13/16 13/16
Num samples 56.1M
Length s 1271.471
Scale max 1.000000
Window s 0.050

#5

just redirect stderr to stdout. try this

set bob to do shell script "echo sox ~/Music/test.aif -n stats 2>&1"
#6

Still doesn’t return what I need. Running this line simply returns the line: “sox /Users/u0316714/Music/test.aif -n stats”, not the data that it produces.

#7

sorry, bad copy and paste on my part. I thought I removed “echo” from there. It should be like this

set bob to do shell script "sox ~/Music/test.aif -n stats 2>&1"
#8

Thanks!