Extracting into bash variables

[Alan Clifford]

I'm rewriting one of my old bash scripts. Is there a better way of extracting these data rather than three calls to exiftool?

ORIENTATION=`exiftool -orientation -n -s -s -s "${IMAGE}"`
WIDTH=`exiftool -imagewidth -n -s -s -s "${IMAGE}"`
HEIGHT=`exiftool -imageheight -n -s -s -s "${IMAGE}"`

[Alan Clifford]

I might be able to answer this myself.

cellini:test alan$ TESTING=`exiftool -s3 -n -orientation -imagewidth -imageheight ~/photographs/temp/x-s1_3655.jpg`


returns in the format

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1 1024 683

I could put that straight into a bash array variable.  But need to look at, for instance, if orientation is missing.

Any other suggestions welcome though.

[Alan Clifford]

This might be it.  Need to test in script with an array.

cellini:test alan$ exiftool -m -s3 -n -p '0=$orientation 1=$imagewidth 2=$imageheight'  x-s1_3655.jpg

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0= 1=1024 2=683


[Phil Harvey]

Maybe something like this?:

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var=`exiftool -f -p 'export orientation="$orientation";export width=$imagewidth;export height=$imageheight' x-s1_3655.jpg`
$var
echo "orientation is $orientation"
...

-Phil

[Alan Clifford]

I'm getting the same sort of problem with as with trying to load an array - they text goes into the variable

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orientation is: "-";export
width is:       1024;export
height is:      683


[Alan Clifford]

var=`exiftool -f -p 'export orientation="$orientation"  width=$imagewidth height=$imageheight' x-s1_3655.jpg`

looks like it works.

[Alan Clifford]

I'd progressed to:

declare -a stuffa
stuff=`exiftool -m -s3 -n -p '${orientation}x ${imagewidth} ${imageheight}'  x-s1_3655.jpg`
stuffa=(${stuff})

It had problems with missing orientation, hence the 'x', and I couldn't make it take defined array subscripts.

Your way is looking good.

I see, -f makes it work.

[Alan Clifford]

Thanks for the help.

[Alan Clifford]

To change the - to a 0 would need MissingTagValue to be set.

Am I right in thinking I'd have to do this in a config file rather than using a command line option?

But I think I have a bash workaround for my purposes

orientation=$((${orientation}0/10))

or

orientation=${orientation#-}

[StarGeek]

Maybe you could use the -args option and then pipe that through sed to get the proper results?

[Alan Clifford]

i've settled on:

orientation=`exiftool -f -m -s3 -n -p '${orientation} ${imagewidth} ${imageheight}'  ${file}`
echo "${file} orientation:  ${orientation}"
a_orientation=(${orientation})  #array
i_orientation=${a_orientation[0]/-/0} #integer
i_width=${a_orientation[1]/-/0}
i_height=${a_orientation[2]/-/0}

[Phil Harvey]

Yes, you can use -api missingtagvalue=0 to change the missing tag value from "-" to "0".

- Phil

[Alan Clifford]

Excellent, thanks.