bash help, renaming file extensions

trey85stang · 06-26-2005, 12:13 AM

I have a directory with about 2,000 files that have various differn't file extensions. I need to get these all these files to have the same extension of .bin or .txt something other then what is there now

Can anyone help a scripting newb, or can this be done with ls and sed?

Thanks
Trey

mjrich · 06-26-2005, 12:27 AM

Just use a Bash script

Code:

#!/bin/bash
for f in *.*; do
     mv -v $f `echo $f | cut -f1 -d. -`.txt
     done

Cheers,

mj

Dark_Helmet · 06-26-2005, 01:12 AM

Just a warning: mjrich's script will work, but it assumes there's only one '.' in the filename. For example, if there was a tarball named "my_backup.tar.bz2", the script would rename it to "my_backup.txt".

Another alternative would be to just slap the extension on the end:

Code:

#!/bin/bash

for filename in *
do
  echo "mv -v ${filename} ${filename}.txt"
  # mv -v ${filename} ${filename}.txt
done

Run the script and scan the output to make sure it looks like it's doing what it should. When you're ready, remove the comment marker '#' from the mv command, and run again. It's not extremely elegant, but it preserves the original filename so you can go back later if need be.

trey85stang · 06-26-2005, 09:41 AM

thanks to both of you, both scripts worked as desired

mjrich · 06-27-2005, 05:39 PM

Re: Just a warning: ....assumes there's only one '.' in the filename.

Cheers -- I should have realised this, as I've fallen into the same trap before

mj

trey85stang · 06-28-2005, 11:04 PM

Quote:

Originally posted by mjrich
Re: Just a warning: ....assumes there's only one '.' in the filename.

Cheers -- I should have realised this, as I've fallen into the same trap before

mj

oddly enough.. there were a few files with more then two .'s but those files were skipped. Only about 20 of them anyways so it was no big deal

mjrich · 06-29-2005, 04:55 PM

Interesting -- must be a different version of Bash or cut perhaps... my ones plow right on through and rename all *.*, including the double dotted files.

Cheers,

mj

mohit dhawan · 06-30-2005, 02:00 AM

echo "mv -v ${filename} ${filename}.txt"

okay confused
just learning shell scrpiting

how does it change the extension
because the move cmd is in quotes and echo would just print that on screen

lampeasouder · 07-21-2005, 04:51 PM

With a little regexp and sed, this could be OK:

for file in $(find /the path/myrep/*) # This work with files in sub directories (absolute path)
do
# Moove only regular files and change the last .something with .txt
[ -f $file ] && mv $file $(echo $file|sed 's/.[a-zAZ-09]*$/.txt/')
done

I think that's ok.