做一个项目，arm11+linux2.6.28，中间一点shell编程

#!/bin/sh
mypath=/home/yuanchm
check_file_exist()
{
echo "check the file write?"
if [ $test -w $mypath/1.png ]
then
    echo "delete it"
    rm $mypath/1.png
else
    echo "not write!"
    sleep 1
    rm $mypath/1.png
fi
}
ftp_down()
{
    echo "ftp to 192.168.1.108"
    wget -P $mypath/ ftp://123:123456@192.168.1.108/1.jpg
}
sleep_60s()
{
for i in 1 6 12 18 24 30 36 42 48 54 60
do
sleep 6
echo $i
done
}
while [ 1 ]
do
check_file_exist
ftp_down
sleep_60s
done