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I use zenity because it's a rewrite of gdialog and also replaces gmessage and has more useful options.
Using --text-info allows you to select and copy the text to your clipboard.
To see a file in a list dialog: cat /etc/passwd | zenity --width 800 --height 600 --list --column Entries
If you don't have zenity, you'll have to download it via apt-get install zenity, etc.
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