#!/bin/sh
## Simple shellscript to index all directories present in a main directory based on their creation time

noofdirs=$(find . -mindepth 1 -maxdepth 1 -type d | wc -l)
lenofnod=$(echo -n "$noofdirs" | wc -m) ## Flag n to prevent newline count

# d flag for reverse indexing i.e most recent file-directory is indexed 1.
if [[ "$1" = "-d" ]]; then
    ls -d */ -vt | cut -d'/' -f1 | nl -w$lenofnod -s ". " -n rz | while read n f; 
        do mv -n "$f" "$n $f" ;
    done
#else by default index oldest file-directory as 1.
else
    ls -d */ -vtr | cut -d'/' -f1 | nl -w$lenofnod -s ". " -n rz | while read n f; 
        do mv -n "$f" "$n $f" ; 
    done
fi