see http://www.imagemagick.org/script/command-line-processing.php#geometry
width
Width given, height automagically selected to preserve aspect ratio.
convert image -resize WIDTH result
seems to work for me. (Also WIDTHx)
IM 6.6.4.7 Q16 Mac OSX Tiger.
Are you on an old release of IM? Perhaps you need to upgrade.
>I have some dozen jpg files together, some landscape oriented, some
>portrait.
>How do I convert the jpgs, so that the width only is always (eg) 500 px ?
>
>When I convert it as below, the longest between width/height gets
>resized to 500 px.
>
>blau:~$ for i in *.jpg; do convert "$i" -resize 500 \
>"${i//.jpg}"-500.jpg; done
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