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diff --git a/atop.daily b/atop.daily
index e0d994f..8c0cfc0 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
@@ -7,11 +7,15 @@ INTERVAL=600 # interval 10 minutes
# verify if atop still runs for daily logging
#
-if [ -e $PIDFILE ] && ps -p `cat $PIDFILE` | grep 'atop$' > /dev/null
-then
- kill -USR1 `cat $PIDFILE` # take final sample
+pid=
+if [ -e $PIDFILE ]; then
+ pid=$(cat $PIDFILE)
+fi
+
+if [ -n "$pid" ] && [ -d /proc/$pid ]; then
+ kill -USR1 $pid # take final sample
sleep 3
- kill -TERM `cat $PIDFILE`
+ kill -TERM $pid
rm $PIDFILE
sleep 1
fi
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