Script to change file extension? 1

[nrastogi]

Hi guys,

I am very new to the scripting world.

I have this directory that has 1000's files with the extension .JPG and .jpg as well.

Since, *ix is case sensitive, that is creating a problem for me.

Could you please let me know the script that would go through all the files and change the extension from JPG to jpg.

I appreciate your help!

Thanks a lot in advance.

NRastogi

 

[nrastogi]

Hi guys,

Thought to mnention that I am using RedHat 7.3 Linux !

Thanks,
NRastogi

 

[toolkit]

Something like this should work

for file in `find . -type f -name "*.JPG"`        
do
  base=`basename $file .JPG`
  mv $file $base.jpg
done

Not that, by default, find recurses through directories. Hope this helps, cheers Neil

 

[nrastogi]

Hi there,

Thanks a lot for posting the script.

I am totally newbie to scripts, could you please let me know the exact steps to run this script.

What I understand I have to save this in a .sh, say chang.sh

how do I run it and pass the parameter from the promt

Thanks

nrastogi

 

[toolkit]

The code above can either be typed directly at your command line prompt, or you can copy the code to a file such as [tt]change.sh[/tt]. All you would need to do for the script version is ensure that the first line in the script resembles:

[tt]#!<path to bash>[/tt]

Linux uses bash (Bourne again shell). To find out where your version of bash is, try typing the following at the command line prompt:

[tt]which bash[/tt]

Then if for example this returns [tt]/usr/bin/bash[/tt], then have the following as the first line in your script:

[tt]#!/usr/bin/bash[/tt]

The example code I showed does not use any parameters. Hope this helps. Cheers, Neil

 

[toolkit]

An example using parameters:

#!<path to bash>

UPPERCASE=$(echo $1 | tr &quot;[:lower:]&quot; &quot;[:upper:]&quot;)
LOWERCASE=$(echo $1 | tr &quot;[:upper:]&quot; &quot;[:lower:]&quot;)

for FILE in $(find . -type f -name &quot;*.$UPPERCASE&quot;)
do
  BASE=$(basename $FILE .$UPPERCASE)
  DIR=$(dirname $FILE)
  echo mv $FILE $DIR/$BASE.$LOWERCASE
  mv $FILE $DIR/$BASE.$LOWERCASE
done

Cheers, Neil

 

[nrastogi]

Thanks a lot Neil,

You have give a life to this newbie

Well, you script did work, I just had to put -f in the mv command line, it was asking me yes or no to overwrite. Which was kinda hard to do manually for 7000 files

Thanks a lot again.

NRastogi

 

[toolkit]

One minor refinement when you have a large number of files. Change:

for FILE in $(find ...)

To:

find .... | while read FILE

I believe this is more efficient.

Cheers, Neil

 

[dickiebird]

Or another way...........
for file in *JPG
do
mv $file `echo $file | sed -e 's/JPG/jpg/g'`
done
;-)
Dickie Bird
Honi soit qui mal y pense

 

[nrastogi]

Hi Guys,

Thanks you all for responding to my question.

I have another issue that is related to same question:

I would like to change the full filename (name + extension) to lowercase of all the files in a directory, including sub-dirs of that file

Please let me know how could I modify the script you have mentioned earlier to get this done.

Thanks,

NRastogi

 

[toolkit]

The find version already does this
Cheers, Neil

 

[jamisar]

dbird: you my be have some 'c' troubles, i congratulate
you for this 'jamisar'conform one-liner. bravo!
-----------
when they don't ask you anymore, where they are come from, and they don't tell you anymore, where they go ... you'r getting older !

 

[jamisar]

i forgot:

for file in *.JPG
do
.... sed -e 's/JPG$/jpg/' ...
done

is a little saver, to prevent:

mv aaa.JPG.JPG aaa.jpg.jpg

i like people doing reasoned things ) -----------
when they don't ask you anymore, where they are come from, and they don't tell you anymore, where they go ... you'r getting older !

 

[nrastogi]

Hi Neil,

>>>> The find version already does this
Cheers, Neil

I did change the script to use find. but how do I pass the parameter from command line to use this new script that would convert UPPERCASE.EXTENSION to lowercase.extenstion

Thanks much,

NRastogi