（1）当前时间命名临时文件：
按照一定的格式获取当前时间：
date +%y-%m-%d_%H:%M:%S
#generate the file name
tmpfile=`date +%y-%m-%d_%H:%M:%S` #create a empty file
>$tmpfile #do what you want to do using the temp file
#...
# #delete temp file
rm -f $tmpfile
（2）当前进程ID命名临时文件：
获取当前进程ID：
$$
#generate the file name
tmpfile=$$ #create a empty file
>$tmpfile #do what you want to do using the temp file
#...
# #delete temp file
rm -f $tmpfile
（3）隐藏的临时文件
#generate the file name
tmpfile="temp" #Temp file middile name
prefix=. #In Linux env, hide the file use .
suffix=_$$ #Using process ID as the suffix of temp file name
tmpfile=${prefix}${tmpfile}${suffix} #create a empty file
>$tmpfile #do what you want to do using the temp file
#...
# #delete temp file
rm -f $tmpfile