cleanup for files in scripts/perf

scripts/perf/sessiondatacollect.sh

@@ -6,9 +6,9 @@
 # Collection such runtime tar balls from all distributed servers to folder
 # /tmp/<sessionid>-<date>-<time> for example: /tmp/56779-11Oct14-09:33:13
 
-currentdir=` pwd `
+currentdir=$(pwd)
 sid=${currentdir##*.}
-ts=` date +%y%h%d-%T `
+ts=$(date +%y%h%d-%T)
 logfile=/tmp/corelog.tgz
 echo Collect data from localhost:$currentdir to $logfile
 cd ..
@@ -18,7 +18,7 @@ if [ ! $? = 0 ]; then
 fi
 cd $currentdir
 
-m=` grep master $currentdir/servers `
+m=$(grep master $currentdir/servers)
 if [ ! $sid = ${m##*=} ]; then
    # quite if this is not a master server
    echo not a master server
@@ -34,13 +34,13 @@ fi
 cp $logfile $logdir/localhost-${currentdir##*.}.tgz
 
 # harvest CORE data from distributed servers
-hs=` grep -v master= $currentdir/servers | awk {'print $2'} `
+hs=$(grep -v master= $currentdir/servers | awk {'print $2'})
 echo hosts are localhost $hs
 for h in $hs; do
     echo checking host $h ...
-    out=` ping -c 1 -w 1 $h | grep " 0 received," `
+    out=$(ping -c 1 -w 1 $h | grep " 0 received,")
     if [ " $out " = "  " ]; then
-        slavesid=` ssh $h tar -tzf $logfile | awk -F / {'print $1'} `
+        slavesid=$(ssh $h tar -tzf $logfile | awk -F / {'print $1'})
         if [ $? = 0 ]; then
             destlogfile=$logdir/$h-${slavesid##*.}.tgz
             echo Collect data from $h:$logfile to $destlogfile