Cfrtjryk

I have a folder with 20000 files in it. I need to split it into subfolders with increasing directory name (dir_1, dir_2....) with each folder having 500 files each in such a way that for example if files are from file_1.png to file_20000, the first folder should contain first 500 files i.e., file_1 to file 500 and immediate folder should contain files in a continued manner i.e, file_501 to file_1000 and so on.

#!/bin/sh



files_per_dir=500



set -- file_*



printf 'There are %d filesn' "$#"

printf 'Putting %d files in each new directoryn' "$files_per_dir"



N=0 # directory counter

n=0 # file counter



for filename do



    if [ "$(( n % files_per_dir ))" -eq 0 ]; then

        N=$(( N + 1 ))

        dir="dir_$N"

        printf 'Creating directory %sn' "$dir"

        # mkdir "$dir"

    fi



    n=$(( n + 1 ))



    printf 'Moving %s to %sn' "$filename" "$dir"

    # mv -i -- "$filename" "$dir"



done

The above would put 500 files into each directory (the actual commands that changes things have been commented out for safety). The filenames are assumed to match file_* and each new directory will be called dir_N where N is a positive integer.

If you want to move the files based on their numerical names (the above sorts the files in lexicographical order), then use

printf 'Moving %s to %sn' "file_$n" "$dir"

# mv -i -- "file_$n" "$dir"

instead (i.e. replace the corresponding two lines in the first script with these, in this order).

Shortened version:

#!/bin/sh



files_per_dir=500



set -- file_*



n=0



for filename do

    n=$(( n + 1 ))



    N=$(( (n/files_per_dir) + 1 ))

    [ ! -d "dir_$N" ] && mkdir "dir_$N"



    # mv -i -- "$filename" "dir_$N"

    # or...

    # mv -i -- "file_$n" "dir_$N"

done

cd lotsafiles

for i in {1..20000}; do

  dirnum="$(((i/500)+1))"

  mkdir -p "dir_${dirnum}" # using -p allows this to be less noisy on repeat runs

  mv "file${i}.png" "dir_${dirnum}"/

done

Something simple along the lines of:

#!/bin/bash

typeset -i i

typeset -i j

typeset -i k



i=0

j=0

k=0

mkdir dir_$j

for file in * ; do

   i=$i+1

   k=$k+1

   if [ $i = 500 ] ; then

       j=$j+1

       i=0

       mkdir  dir_$j

   fi

   mv "$file" dir_$j/file_$k

done

Not tested, so you might put an echo in front of the mv "$file" dir_$j to see if it does what you want. Anyway it will give you an idea of how to do what you want.