shell 脚本断点执行

#!/bin/bash
a=0
b=0
val=`expr $a + $b`

for f in `find /home/sdata/30092/ -name "*.data" |xargs wc -l |gawk '{print $1}'`
do
 currentFileLines=$f
 val=$[$val+$currentFileLines]
#断点read
 read
#       val=$($val + $currentFileLines)
#       val = `expr $val + $currentFileLines`
 echo "The file is: $f  , currentFileLines:${currentFileLines}"
#       echo "$f"
#       echo "$currentFileLines"
done

echo " : $val"