example.gregorio-test.rc

# this is a shell script fragment
COLOR=true
VIEW_TEXT="less {file}"
DIFF_TEXT="vi -d {expect} {output}"
if [ "$DISPLAY" != "" ]
then
    VIEW_PDF="zathura {file}"
    VIEW_IMAGES="pqiv {files}"
    #DIFF_PDF="evince {expect} {output}"
fi