List images that have a size less than 700 pixel in either width or height.

Somehow, I am getting an error. I will show the commands and
the errors then I will list the images info extarcted by
'exiftool .'
<code>
exiftool -if '$imagewidth &lt; 600' .

File not found: $imagewidth &lt; 600
======== ./ksi-2131.jpg
======== ./ksi-2132.jpg
======== ./ksi-2134.jpg
======== ./ksi-2139.jpg
    1 directories scanned
    4 image files read
</code>


hmmm! I have images with witdh &lt; 600. Why 'file  not
found'?

<code>
exiftool -if '$imagesize and ($imagewidth&lt;700 or
$imageheight&lt;700)' -q -t -S -filename -r .

File not found: $imagesize and ($imagewidth&lt;700 or
$imageheight&lt;700)
ksi-2131.jpg
ksi-2132.jpg
ksi-2134.jpg
ksi-2139.jpg

</code>
why not?

<code>
======== ksi-2131.jpg
ExifTool Version Number         : 6.00
File Name                       : ksi-2131.jpg
File Size                       : 128 kB
File Modification Date/Time     : 2007:01:06 22:08:56
File Type                       : JPEG
MIME Type                       : image/jpeg
JFIF Version                    : 1.1
Resolution Unit                 : inches
X Resolution                    : 96
Y Resolution                    : 96
Image Width                     : 274
Image Height                    : 418
Image Size                      : 274x418
======== ksi-2132.jpg
ExifTool Version Number         : 6.00
File Name                       : ksi-2132.jpg
File Size                       : 92 kB
File Modification Date/Time     : 2007:01:06 22:16:58
File Type                       : JPEG
MIME Type                       : image/jpeg
JFIF Version                    : 1.1
Resolution Unit                 : None
X Resolution                    : 1
Y Resolution                    : 1
Image Width                     : 936
Image Height                    : 700
Image Size                      : 936x700
======== ksi-2134.jpg
ExifTool Version Number         : 6.00
File Name                       : ksi-2134.jpg
File Size                       : 94 kB
File Modification Date/Time     : 2007:01:06 22:04:57
File Type                       : JPEG
MIME Type                       : image/jpeg
JFIF Version                    : 1.2
Resolution Unit                 : inches
X Resolution                    : 300
Y Resolution                    : 300
Image Width                     : 600
Image Height                    : 480
Image Size                      : 600x480
======== ksi-2139.jpg
ExifTool Version Number         : 6.00
File Name                       : ksi-2139.jpg
File Size                       : 847 kB
File Modification Date/Time     : 2007:01:06 22:04:57
File Type                       : JPEG
MIME Type                       : image/jpeg
JFIF Version                    : 1.2
Resolution Unit                 : inches
X Resolution                    : 300
Y Resolution                    : 300
Image Width                     : 1534
Image Height                    : 1350
Image Size                      : 1534x1350
    4 image files read
</code>

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