nyan now checks that pv exists before starting.

nyan

@@ -2,10 +2,14 @@
 optstring="o:"
 declare -i abort=0
 
-# TODO: Check for dependencies pv and stat.
 # TODO: Add help option to display usage.
 # TODO: Consider a switch for per-file progress bars rather than a whole-operation one.
 
+if [ ! -e "$(which pv)" ]; then
+	echo "Error: pv does not seem to be installed. Exiting."
+	exit 1
+fi
+
 while getopts ${optstring} args; do
 	case $args in
 		o) output_file=${OPTARG} ;;