renumberfile(NAME, P) renumbers the files matching NAME having an index 
following the substring P, using consecutive indices starting from 1. 
Wildcards (*) and brackets (see rdir) may be used in NAME. If P is 
present several times in a filename, uses only the last occurrence. 
renumberfile works only in the current directory (NAME cannot contain 
pathnames). 
 
renumberfile(NAME, P, NEWNUM) does the same, using NEWNUM to renumber 
the files. If NEWNUM is a number, uses consecutive indices starting 
from NEWNUM. If NEWNUM is an array, uses it to renumber the files. By 
default, NEWNUM=1. 
 
renumberfile(NAME, P, NEWNUM, NZ) specifies the number of 0 pading the 
index (e.g., '302' paded with 5 zeros is '00302'). By default, NZ=5. 
 
renumberfile(NAME, P, NEWNUM, NZ, OPT), where OPT is 'dironly', 
'fileonly' or 'filedir', renumbers only the directory names, the file 
names, or both (by default), respectively. 
 

 
   If renumberfile('DSC*.JPG','DSC') is used in a directory that 
   contains 100 JPG-files with arbitrary file numbers, the files are 
   renumbered as 'DSC00001.JPG'...'DSC00100.JPG'. 
 
   renumberfile('DSC*.JPG','DSC',401) does the same, renumbering 
   the files as 'DSC00401.JPG'...'DSC00500.JPG'. 
 
   renumberfile('DSC*.JPG','DSC',1,3) does the same, renumbering 
   the files as 'DSC001.JPG'...'DSC100.JPG'. 
 

getfilenum, rdir, renamefile.