HOW to get SAR Report for one month or 31 days with single command

ls /var/log/sa/sa[0-9][0-9] | while read safile ; do sar -u -f "$safile" ; done > /tmp/sareport_cpu

ls /var/log/sa/sa[0-9][0-9] | while read safile ; do sar -r -f "$safile" ; done > /tmp/sareport_memory

ls /var/log/sa/sa[0-9][0-9] | while read safile ; do sar -q -f "$safile" ; done > /tmp/sareport_load_average