Bourne shell scripting question

jnavar3 · 07-19-2011, 12:10 PM

I got this Bourne shell command to add date and time to photos:

convert your_test_photo.jpg -font Arial -pointsize 72 -fill white -annotate +100+100 %[exif:DateTimeOriginal] output.jpg

Longer version of script at:
http://dptnt.com/2009/08/add-date-time-stamp-to-jpeg-photos-using-free-software-mac-linux-nix-edition/

to output YYYY:MM:DD HH:MM:SS by default to MM/DD/YYYY HH:MM:SS change to date format and "colon" forward slash?

David the H. · 07-19-2011, 01:12 PM

Please use [code][/code] tags around your code, to preserve formatting and to improve readability.

The %[exif:DateTimeOriginal] string means it's simply inserting the date straight from the image's exif tags. If you wanted to convert the format you'd have to use a separate command and extract the string and reformat it separately. Then re-insert the revised version into your final command in place of the original exif entry.

This is untested, but assuming that the date format is consistent, it will likely work:

Code:

formatteddate=$( identify -format %[exif:DateTimeOriginal] your_test_photo.jpg | awk -F "[: ]" '{ print $2"/"$3"/"$1" "$4":"$5":"$6 }' )

convert your_test_photo.jpg -font Arial -pointsize 72 -fill white -annotate +100+100 "$formatteddate" output.jpg

jnavar3 · 07-19-2011, 01:17 PM

I'm gonna try that... Meanwhile I got this to work inserting this...

# Custom timestamp string
IFS=$IFS: read -r year month day hour minute second <<< $(identify -format "%[EXIF:DateTimeOriginal]" "$file");
DTString="$month/$day/$year $hour:$minute:$second"

# The real deal here
convert "$file" -gravity SouthEast -font "$font" -pointsize $pointsize -undercolor "#00000080" -fill orange -annotate +$pointsize+$pointsize "$DTString" "$output"

David the H. · 07-19-2011, 01:22 PM

Yeah, that'll work too. It's pretty much the same thing as I did, except that it uses bash's read built-in to split the string into individual variables, instead of awk.

And again, please use [code][/code] tags around your code, to preserve formatting and to improve readability.

Tinkster · 07-19-2011, 01:42 PM

Does this help at all?

Cheers,
Tink