알고 보니 sar라는 명령어가 존재하지 않아 발생한 문제였음.

[root@digimoon:~/bin/log]# find /root | xargs grep 'log.sar'
/root/bin/sbin/system_check_graph:        cat /root/bin/log/log.sar | awk '{ printf $1" "}'
/root/bin/sbin/system_check_graph:        cat /root/bin/log/log.sar | awk '{ printf $2" "}'
/root/bin/sbin/system_check_graph:        cat /root/bin/log/log.sar | awk '{ printf $3" "}'
/root/bin/sbin/system_check_graph:        cat /root/bin/log/log.sar | awk '{ printf $4" "}'
/root/bin/sbin/system_test:sar | grep "all" | tail -1 | awk '{print $(NF-4)" "$(NF-2)" "$(NF-1)" "100-$(NF)}' >> /root/bin/log/log.sar
/root/bin/sbin/system_test:     cat /root/bin/log/log.sar | tail -288 > /root/bin/log/log.tmp.tmp
/root/bin/sbin/system_test:     cat /root/bin/log/log.tmp.tmp > /root/bin/log/log.sar
grep: {}: 그런 파일이나 디렉토리가 없음
grep: ;: 그런 파일이나 디렉토리가 없음
[root@digimoon:~/bin/log]#
 

sysstat 패키지를 설치
[root@digimoon:~/bin/log]#yum install sysstat
Loaded plugins: fastestmirror
Loading mirror speeds from cached hostfile
 * base: centos.mirror.cdnetworks.com
 * updates: centos.mirror.cdnetworks.com
 * addons: centos.mirror.cdnetworks.com
 * extras: centos.mirror.cdnetworks.com
Excluding Packages in global exclude list
Finished
Setting up Install Process
Parsing package install arguments
Resolving Dependencies
--> Running transaction check
---> Package sysstat.i386 0:7.0.2-3.el5 set to be updated
--> Finished Dependency Resolution

Dependencies Resolved

=============================================================================================================================
 Package                       Arch                       Version                           Repository                  Size
=============================================================================================================================
Installing:
 sysstat                       i386                       7.0.2-3.el5                       base                       169 k

Transaction Summary
=============================================================================================================================
Install      1 Package(s)
Update       0 Package(s)
Remove       0 Package(s)

Total download size: 169 k
Is this ok [y/N]: y
Downloading Packages:
sysstat-7.0.2-3.el5.i386.rpm                                                                          | 169 kB     00:00
Running rpm_check_debug
Running Transaction Test
Finished Transaction Test
Transaction Test Succeeded
Running Transaction
  Installing     : sysstat                                           [1/1]

Installed: sysstat.i386 0:7.0.2-3.el5
Complete!
[root@digimoon:~/bin/log]#


이제 sar 커맨드가 존재하는 것을 확인할 수 있다.
[root@digimoon:~/bin/log]# which sar
/usr/bin/sar