What's the output of the second command if you run these two commands in order?
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su nagios
cat /var/lib/mrtg/192.168.2.126_182.log
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su nagios
cat /var/lib/mrtg/192.168.2.126_182.log
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[nagios@localhost jmaq]$ ll /var/lib/mrtg/
total 2544
-rw-r--r-- 1 apache nagios 48180 May 8 16:36 192.168.2.126_102.log
-rw-r--r-- 1 apache nagios 48197 May 8 16:36 192.168.2.126_10.log
-rw-r--r-- 1 apache nagios 48203 May 8 16:36 192.168.2.126_11.log
-rw-r--r-- 1 apache nagios 48201 May 8 16:36 192.168.2.126_12.log
-rw-r--r-- 1 apache nagios 48203 May 8 16:36 192.168.2.126_13.log
-rw-r--r-- 1 apache nagios 48200 May 8 16:36 192.168.2.126_14.log
-rw-r--r-- 1 apache nagios 48203 May 8 16:36 192.168.2.126_15.log
-rw-r--r-- 1 apache nagios 48201 May 8 16:36 192.168.2.126_16.log
-rw-r--r-- 1 apache nagios 48203 May 8 16:36 192.168.2.126_17.log
-rw-r--r-- 1 apache nagios 48197 May 8 16:36 192.168.2.126_18.log
-rw-r--r-- 1 apache nagios 48204 May 8 16:36 192.168.2.126_19.log
-rw-r--r-- 1 apache nagios 48204 May 8 16:36 192.168.2.126_1.log
-rw-r--r-- 1 apache nagios 48201 May 8 16:36 192.168.2.126_20.log
-rw-r--r-- 1 apache nagios 48203 May 8 16:36 192.168.2.126_21.log
-rw-r--r-- 1 apache nagios 48203 May 8 16:36 192.168.2.126_22.log
-rw-r--r-- 1 apache nagios 48204 May 8 16:36 192.168.2.126_23.log
-rw-r--r-- 1 apache nagios 48180 May 8 16:36 192.168.2.126_24.log
-rw-r--r-- 1 apache nagios 48203 May 8 16:36 192.168.2.126_25.log
-rw-r--r-- 1 apache nagios 48180 May 8 16:36 192.168.2.126_26.log
-rw-r--r-- 1 apache nagios 48203 May 8 16:36 192.168.2.126_27.log
-rw-r--r-- 1 apache nagios 48199 May 8 16:36 192.168.2.126_28.log
-rw-r--r-- 1 apache nagios 48202 May 8 16:36 192.168.2.126_29.log
-rw-r--r-- 1 apache nagios 48204 May 8 16:36 192.168.2.126_2.log
-rw-r--r-- 1 apache nagios 48193 May 8 16:36 192.168.2.126_30.log
-rw-r--r-- 1 apache nagios 48202 May 8 16:36 192.168.2.126_31.log
-rw-r--r-- 1 apache nagios 48203 May 8 16:36 192.168.2.126_32.log
-rw-r--r-- 1 apache nagios 48203 May 8 16:36 192.168.2.126_33.log
-rw-r--r-- 1 apache nagios 48180 May 8 16:36 192.168.2.126_34.log
-rw-r--r-- 1 apache nagios 48200 May 8 16:36 192.168.2.126_35.log
-rw-r--r-- 1 apache nagios 48203 May 8 16:36 192.168.2.126_36.log
-rw-r--r-- 1 apache nagios 48203 May 8 16:36 192.168.2.126_37.log
-rw-r--r-- 1 apache nagios 48180 May 8 16:36 192.168.2.126_38.log
-rw-r--r-- 1 apache nagios 48203 May 8 16:36 192.168.2.126_39.log
-rw-r--r-- 1 apache nagios 48203 May 8 16:36 192.168.2.126_3.log
-rw-r--r-- 1 apache nagios 48200 May 8 16:36 192.168.2.126_40.log
-rw-r--r-- 1 apache nagios 48203 May 8 16:36 192.168.2.126_41.log
-rw-r--r-- 1 apache nagios 48180 May 8 16:36 192.168.2.126_42.log
-rw-r--r-- 1 apache nagios 48202 May 8 16:36 192.168.2.126_43.log
-rw-r--r-- 1 apache nagios 48180 May 8 16:36 192.168.2.126_44.log
-rw-r--r-- 1 apache nagios 48201 May 8 16:36 192.168.2.126_45.log
-rw-r--r-- 1 apache nagios 48180 May 8 16:36 192.168.2.126_46.log
-rw-r--r-- 1 apache nagios 48194 May 8 16:36 192.168.2.126_47.log
-rw-r--r-- 1 apache nagios 48203 May 8 16:36 192.168.2.126_48.log
-rw-r--r-- 1 apache nagios 48206 May 8 16:36 192.168.2.126_49.log
-rw-r--r-- 1 apache nagios 48180 May 8 16:36 192.168.2.126_4.log
-rw-r--r-- 1 apache nagios 48180 May 8 16:36 192.168.2.126_50.log
-rw-r--r-- 1 apache nagios 48207 May 8 16:36 192.168.2.126_51.log
-rw-r--r-- 1 apache nagios 48196 May 8 16:36 192.168.2.126_52.log
-rw-r--r-- 1 apache nagios 48203 May 8 16:36 192.168.2.126_5.log
-rw-r--r-- 1 apache nagios 48202 May 8 16:36 192.168.2.126_6.log
-rw-r--r-- 1 apache nagios 48203 May 8 16:36 192.168.2.126_7.log
-rw-r--r-- 1 apache nagios 48180 May 8 16:36 192.168.2.126_8.log
-rw-r--r-- 1 apache nagios 48203 May 8 16:36 192.168.2.126_9.log