#!/bin/bash

if [ "$1" == "" ]; then
	echo "No file given!"
	exit 1
fi

for (( i = 4; i >= 0; i-- )) ; do
	# In %_d the underscore is important since it demands `date`
	# to pad with spaces (like syslog for e.g. "Jan  1" to "Jan  9")
	# instead of zeros.
	dstring=`LANG=C date -d "-$i min" +"%b %_d %R"`
	#echo "Entries for '$dstring':"
	grep "^$dstring:.. " $1
done