[hanzer]

Originally Posted by GarryR

[snip]
Wondering if anyone knows how to maybe add some input option, so that it prompts me to
put in the name of the image I want as a background.
[snip]

This isn't what you asked for - it doesn't simulate a dialog - but the method might get the job done in a more straightforward manner...

How can I pass a command line argument into a shell script?

Example:
$HOME/bin/test.ksh

#!/bin/ksh
echo $0
echo $1
echo $2

Demo:

hanzer@lucidrine:/home/hanzer:859 $ test.ksh                                                              
/home/hanzer/bin/test.ksh


hanzer@lucidrine:/home/hanzer:860 $ test.ksh foo
/home/hanzer/bin/test.ksh
foo

hanzer@lucidrine:/home/hanzer:861 $ test.ksh foo bar
/home/hanzer/bin/test.ksh
foo
bar
hanzer@lucidrine:/home/hanzer:862 $ test.ksh foo bar baz
/home/hanzer/bin/test.ksh
foo
bar
hanzer@lucidrine:/home/hanzer:863 $