Invalid system activity file (corrupt).

Issue

• On my server, attempting to read sar output results in the following error:

for f in /var/log/sa/sa[0-9]* ; do if sar -A -t -f "$f" > /dev/null 2>&1 ; then echo " Valid system activity file: $f"; elif sar -A -t --legacy -f "$f" > /dev/null 2>&1 ; then echo " Legacy system activity file: $f" ; else echo "Invalid system activity file: $f" ; fi ; done
 Valid system activity file: /var/log/sa/sa01
 Valid system activity file: /var/log/sa/sa02
 Valid system activity file: /var/log/sa/sa03
 Valid system activity file: /var/log/sa/sa04
Invalid system activity file: /var/log/sa/sa05
Invalid system activity file: /var/log/sa/sa06
Invalid system activity file: /var/log/sa/sa07
 Valid system activity file: /var/log/sa/sa08
 Valid system activity file: /var/log/sa/sa09
 Valid system activity file: /var/log/sa/sa10
 Valid system activity file: /var/log/sa/sa11
 Valid system activity file: /var/log/sa/sa12
 Valid system activity file: /var/log/sa/sa13
 Valid system activity file: /var/log/sa/sa14
 Valid system activity file: /var/log/sa/sa15
 Valid system activity file: /var/log/sa/sa16
 Valid system activity file: /var/log/sa/sa17
 Valid system activity file: /var/log/sa/sa18
 Valid system activity file: /var/log/sa/sa20
 Valid system activity file: /var/log/sa/sa21
 Valid system activity file: /var/log/sa/sa22
 Valid system activity file: /var/log/sa/sa23
 Valid system activity file: /var/log/sa/sa24
 Valid system activity file: /var/log/sa/sa25
 Valid system activity file: /var/log/sa/sa26
 Valid system activity file: /var/log/sa/sa27
 Valid system activity file: /var/log/sa/sa28