[SOLVED] Bash: How can I rename files in alphabetical order and make extensions uppercase?

FatalKeystroke · 10-21-2010, 03:27 PM

I am trying to write a bash script that will extract a .cbr (.rar) file, traverse the extracted files in alphabetical order and rename them 001.JPG, 002.JPG, 003.JPG, etc.

So far I only have this much to extract it:

Code:

#!/bin/bash
#
#

inputfile="${1}"

extractdir="${inputfile%.cbr}"
mkdir "${extractdir}"
cd "${extractdir}"
unrar e "../${1}"

Can anyone recommend how I might go about renaming the files as specified above while retaining their original order (and changing all lowercase extensions to uppercase)?

forrestt · 10-21-2010, 05:19 PM

Code:

for FILE in * ; do
        let COUNT=COUNT+1
        if [ ${COUNT} -lt 10 ] ; then
                NEWFILE=00${COUNT}.jpg
        elif [ ${COUNT} -lt 100 ] ; then
                NEWFILE=0${COUNT}.jpg
        else
                NEWFILE=${COUNT}.jpg
        fi  
        if [ ! -e ${NEWFILE} ] ; then
                mv ${FILE} ${NEWFILE}
        fi  
done

HTH

Forrest

neonsignal · 10-21-2010, 05:51 PM

You could do something like this, though it is cheating a bit:

Code:

rename '$a=(defined $a?$a:0)+1; s/.*/$a.JPG/' *.jpg

crts · 10-21-2010, 05:57 PM

Another alternative

Code:

#!/bin/bash
def=000
for f in *;do
  ((cnt++))
  if [[ ! -e "${def:${#cnt}:${#def}}${cnt}.JPG" ]];then
    echo mv "${f}" "${def:${#cnt}:${#def}}${cnt}.JPG" #remove preceding echo if everything is fine
  fi
done

If you want to change the format to something like 0001.jpg,0002./jpg, i.e. to 4 digits then just change 'def' to

Code:

def=0000

Remove the 'echo' if the output looks ok.

FatalKeystroke · 10-21-2010, 08:10 PM

Thank you!
I'm going to use the solution given by forrestt since it's the only one I understand (I'm still learning bash scripting). The other two are beyond my expertise right now.

I still have one question though. Will this keep the files in alphabetical order? Does bash automatically sort files alphabetically when processing them this way?
(I have little way of checking to make sure they are still in order afterwards)
Thank you for the help!

grail · 10-21-2010, 08:15 PM

Well they will be in number order afterwards.

FatalKeystroke · 10-21-2010, 08:26 PM

What I mean is, say the original files are:

a.jpg
c.jpg
b.jpg
d.jpg

will they be renamed like this?

a.jpg -> 001.JPG
c.jpg -> 003.JPG
b.jpg -> 002.JPG
d.jpg -> 004.JPG

neonsignal · 10-21-2010, 08:38 PM

Quote:

Originally Posted by FatalKeystroke

Will this keep the files in alphabetical order? Does bash automatically sort files alphabetically when processing them this way?

The glob expansion in the scripts (the '*') will sort in collation order. Depending on your environment settings, this might do what you want (strict "C" ordering would place uppercase ahead of lowercase, whereas "en_US" for example will be alphabetical).

Just do the following to see if you get the ordering you want:

Code:

echo *

Incidentally, if any of the filenames have spaces in them, you might need some judicious quotes in the script you intend to use.

FatalKeystroke · 10-21-2010, 08:52 PM

Thank you!
I performed "echo *" in one of my more cluttered directories and it came out alphabetized.

Thank you very much for your help everyone!