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diff --git a/atop.daily b/atop.daily
index c72214c..ac4b3b7 100755
--- a/atop.daily
+++ b/atop.daily
@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/bin/sh
CURDAY=`date +%Y%m%d`
LOGPATH=/var/log/atop
BINPATH=/usr/bin
@@ -7,15 +7,20 @@ INTERVAL=600 # interval 10 minutes
# verify if atop still runs for daily logging
#
-if [ -e $PIDFILE ] && ps -p `cat $PIDFILE` | grep 'atop$' > /dev/null
+pid=
+if [ -e $PIDFILE ]; then
+ pid=$(cat $PIDFILE)
+fi
+
+if [ -n "$pid" ] && [ -d /proc/$pid ]
then
- kill -USR2 `cat $PIDFILE` # final sample and terminate
+ kill -USR2 $pid # final sample and terminate
CNT=0
- while ps -p `cat $PIDFILE` > /dev/null
+ while [ -d /proc/$pid ]
do
- let CNT+=1
+ CNT=$(($CNT + 1))
if [ $CNT -gt 5 ]
then
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