求助，全局变量居然赋值无效？？ - Chinaunix

#!/usr/bin/bash
ttsize=0
ttfile=0
ttdir=0
#parse rwx to number
prp()
{
#read a
result=0
if test ${1:0:1} = "r"
then
let 'result=result+4'
fi
if test ${1:1:1} = "w"
then
let 'result=result+2'
fi
if test ${1:2:1} = "x"
then
let 'result=result+1'
fi
printf $result
}
sed -n 's/$^[d-].\{9\}$+\? .\+ .\+ .\+ $[0-9]\+$ .\+ .\+ .\+ $[^ ]\+$/\1 \2 \3/p'|while read i
do
prp ${i:1:3}
prp ${i:4:3}
prp ${i:7:3}
printf "\t"
if test ${i:0:1} = "d"
then
ttfile=`expr $ttfile + 1`
printf "dir\t"
fi
if test ${i:0:1} = "-"
then
ttdir=`expr $ttdir + 1`
printf "file\t"
fi
printf "\t"
echo ${i:10} | sed -n 's/$^[0-9]\+$ $.\+$/\1\t\2/p'|sed 's/^0//'
echo ${i:10} | sed -n 's/$^[0-9]\+$ .\+/\1/p'|while read filesize
do
ttsize=`expr $ttsize + $filesize`
done
done
echo "Total Dir: "$ttfile
echo "Total File: "$ttdir
echo "Total File Size: "$ttsize

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