shell function/for in/for (())/string concat/has dir/rename using regex/if(())/exit/execute command and pass value to variable/execute python

#!/bin/bash

#remove the MER.*_ in file name for all the files in a dir
function getdir(){
    for element in `ls $1`
    do  
        dir_or_file=$1"/"$element
        if [ -d $dir_or_file ]
        then 
            getdir $dir_or_file
        else
        #deal with each file in dir
            mv $dir_or_file `echo $dir_or_file|sed ‘s/MER.*)_//g‘`
        fi  
    done
}


#check the input args
if (($#<1));then
echo "please input the dir of calibration images"
exit
fi

root_dir=$1
getdir $root_dir

#create the dir name using timestr
result_dir="./result_of_"$(date +%Y:%m:%d-%H:%M)

echo $result_dir


#if the dir doesn‘t exists, create
if [ ! -d $result_dir ];then
mkdir $result_dir
fi

# execute python program
python zss_calibrateFrom_whole_dir.py $root_dir $result_dir


##########################
#for i in  4 7
#for((i=0;i<10;i++));
#do
    #echo $i
    #for file in `ls ./cali-8-14-18/"$i"/*.png`
    #do
        #mv $file `echo $file|sed ‘s/MER.*)_//g‘`
    #done;
#done;