Similarly to checking the integrity of an rpm, you can also check the integrity of your installed files using rpm -V. This step makes sure that the files haven't been modified since they were installed from the rpm:

# rpm -V xsnow

Normally this command displays no output to indicate a clean bill of health. Let's spice things up and try again:

# rm /usr/X11R6/man/man1/xsnow.1x.gz

# cp /bin/sh /usr/X11R6/bin/xsnow

# rpm -V xsnow
S.5....T   /usr/X11R6/bin/xsnow
missing    /usr/X11R6/man/man1/xsnow.1x.gz

This output shows us that the Xsnow binary fails MD5 sum, file size, and mtime tests. And the man page is missing altogether! Let's repair this broken installation:

# rpm -e xsnow
removal of /usr/X11R6/man/man1/xsnow.1x.gz failed: No such file or directory

# rpm -ivh xsnow-1.41-1.i386.rpm 
xsnow                       ##################################################