UPD: changed to column format

sh/sar-weekly.sh

@@ -1,8 +1,11 @@
 #!/usr/bin/env bash
+echo "Date CPUUsed MEMUsed IOWait"  > /tmp/sar-report.txt
 for f in $(ls /var/log/sysstat/sa[0123]*); do
-echo -n "Date: "; stat $f | grep Modify | awk '{print $2}'
-sar -f $f | tail -1 | awk '{print "CPU Used: ", 100-$NF}'
-sar -r -f $f | tail -1 | awk '{print "Memused: "$5}'
-sar -f $f | tail -1 | awk '{print "iowait: "$6}'
-echo "- - -"
+SARDate=$(stat $f | grep Modify | awk '{print $2}')
+CPUUsed=$(sar -f $f | tail -1 | awk '{print 100-$NF}')
+MEMUsed=$(sar -r -f $f | tail -1 | awk '{print $5}')
+IOWait=$(sar -f $f | tail -1 | awk '{print $6}')
+echo "$SARDate $CPUUsed $MEMUsed $IOWait" >> /tmp/sar-report.txt
 done
+cat /tmp/sar-report.txt | column -t
+rm -f /tmp/sar-report.txt