[galaxy-user] A simple operation didn't work out

Hi All, I got a bit disappointed when I failed in the following operation which seems to be simple. I uploaded mouse annotation/reference gene sets (GTF format) to Galaxy. The file is located at ftp://ftp.ensembl.org/pub/release-65/gtf/mus_musculus/. As far as I know, GTF file is tab delimited, thus I used "Filter and Sort" --"filter" With following condition:C1 == 19 . column 1 is where chromosomes are located. I want to pick up all lines which belong to chromosome19. However, I only got an empty file. I know this is not a bit issue to discuss here. But I still hope you can help me figure out what 's wrong. Thanks Jiwen