Remove "file" from test/interlace
PATH=${PWD%code*}code:$PATH
printf 'P5 2 2 3\n\0\1\2\3' |
-pripamtopng - | priweavepng --interlace - | file - | grep -q 'PNG.* interlace'
+pripamtopng - | priweavepng --interlace - | pripnglsch - |
+ grep -q 'IHDR.*00000002000000020200000001'
