How to move files into newly created directory on condition in shell/perl

Question

It was a mess of music files and directory.

It is needed to perform the below operation over multiple directories at once:

1. If the directory contains ".jpg" files, then create a new directory "Covers" and move those files into it.
2. If the directory does not contain any ".jpg" files, don't create "Covers" directory
3. If the directory already contains "Covers" directory, don’t create "Covers" directory

Answer 1

In bash:

#!/bin/bash
shopt -s nullglob
for dir; do
    [[ -d $dir ]] || continue
    jpgs=( "${dir}"/*.jpg )
    if (( "${#jpgs[@]}" )); then
        [[ -d ${dir}/Covers ]] || mkdir "${dir}/Covers"
        # Avoiding race condition by not reusing the jpgs array
        for jpg in "${dir}"/*.jpg; do
            mv "$jpg" "${dir}/Covers"
        done
    fi
done

Answer 2

I am still a rookie but here is mine:

#!/bin/bash
current_directory=$(pwd)
#echo $current_directory
(find -maxdepth 1 -type d -name '*' ! -name '.*' -printf '%f\n')>filelist
number=$(find -maxdepth 1 -type d -name '*' ! -name '.*' -printf '%f\n' | wc -l)
for iteration in `seq $number`
do
    fname=$(head -1 filelist)
    sed 1d < filelist > filelist2
    mv filelist2 filelist
    cd "$fname"
    if [ -z $(ls | grep -i jpg) ]
    then echo "Doing nothing as there are no JPG files....."
    else
        total=$(ls -l|grep -i jpg | wc -l)
        mkdir -p Covers
        mv *.jpg Covers
        echo "Moved $total JPG Files....."
    fi
    cd "$current_directory"
done  

Simply go into the main music directory and execute this script.

No need to pass any arguments

EDIT: It was sloppy before. It is sloppier now. But I think it will work.

Answer 3

#!/bin/bash  

SAVEIFS=$IFS  
IFS="\n\b"  
#-----------------------------------------------------------------------------  

#work in current dir if work path was not provided  
[ $# -eq 0 ] && search_path="." || search_path="$1"  


# files to be moved, more extensions can be added  
wildcard="*[jpg|JPG]"  


move_jpg() {  
    # create "Covers" if it doesn't exist  
    [ -d "$1/Covers" ] && echo -n " ... " || { echo -n " ...create Covers ";   mkdir "$1/Covers" }  

    mv "$1/$wildcard" "$1/Covers/$wildcard"  
    echo "... files moved"  
}  



for d in "$search_path/*/"; do  

    echo -n "testing <$d>   "  

    [ -e "$d/$wildcard" ] && ${move_jpg "$d"} || echo "...Not found <$wildcard>"  

done  



#-----------------------------------------------------------------------------  
IFS=$SAVEIFS