Use the --text-info option to create a text information dialog.
The text information dialog supports the following options:
Specifies a file that is loaded in the text information dialog.
Allows the displayed text to be edited. The edited text is returned to standard error when the dialog is closed.
The following example script shows how to create a text information dialog:
#!/bin/sh
FILE=`zenity --file-selection \
--title="Select a File"`
case $? in
0)
zenity --text-info \
--title=$FILE \
--filename=$FILE \
--editable 2>/tmp/tmp.txt;;
1)
echo "No file selected.";;
-1)
echo "No file selected.";;
esac