xdpyinfo | grep dimensions | perl -pe 's|.*?(\d*x\d*).*|\1|'
1920x1200
最初上記の方法でやったけれど下でも可能
xdpyinfo | grep 'dimensions' | egrep -o '[0-9]+x[0-9]+' | head -1
1920x1200
まだまだ遠回りしている気がする
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