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Replace file name extension in loop

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# 1  
Old 03-31-2011
Replace file name extension in loop
Hi!

I have this shell script that I need to finish. Currently I need to fix one line to make it work. I need to change a file extension. See this code, is pretty simple.

Code:
#!/bin/sh

# Extensions
OLD_EXT=.flv
NEW_EXT=.mp4

COUNT_FILES=$(ls -l *$OLD_EXT | grep ^- | wc -l)

if [ $COUNT_FILES -gt 0 ]; then

for f in *$OLD_EXT; do

$NEW_FILE=$(sed 's/$OLD_EXT/$NEW_EXT/g' $f)

echo "Old File: " $f
echo "New File: " $NEW_FILE

done

fi

I need to fix the line:
Code:
$NEW_FILE=$(sed 's/$OLD_EXT/$NEW_EXT/g' $f)

What I need in that line is that the variable $NEW_FILE is the value of $f, but replaced the file extension.

Example:
20110318175645.test_file_name.flv
will become:
20110318175645.test_file_name.mp4

I don't want to change the filename of the physical file, just the variable name for screen output in the loop.

But that is not working with that code. How is the correct code?

Thanks!
# 2  
Old 03-31-2011
Change...
Code:
$NEW_FILE=$(sed 's/$OLD_EXT/$NEW_EXT/g' $f)

...to...
Code:
NEW_FILE=$(echo $f | sed "s/$OLD_EXT/$NEW_EXT/g")

---------- Post updated at 09:56 AM ---------- Previous update was at 09:54 AM ----------

Or...
Code:
NEW_FILE=${f%$OLD_EXT}$NEW_EXT

This User Gave Thanks to Ygor For This Post:
pulsorock
# 3  
Old 03-31-2011
The code
Code:
NEW_FILE=${f%$OLD_EXT}$NEW_EXT

Did the trick... thank you very much! Smilie
# 4  
Old 03-31-2011
your code
Code:
COUNT_FILES=$(ls -l *$OLD_EXT | grep ^- | wc -l)

if [ $COUNT_FILES -gt 0 ]; then

if redundant. If your for loop does not find your files, then it won't process. So no need to count at all.
# 5  
Old 03-31-2011
Quote:
Originally Posted by kurumi
your code
Code:
COUNT_FILES=$(ls -l *$OLD_EXT | grep ^- | wc -l)

if [ $COUNT_FILES -gt 0 ]; then

if redundant. If your for loop does not find your files, then it won't process. So no need to count at all.
Hi,

I'm not sure I understand.

What changes do you suggest to the script?

Thanks
# 6  
Old 03-31-2011
Just
Code:
for f in *$OLD_EXT; do
  ....
  echo "Old File: " $f
  echo "New File: " $NEW_FILE
  .....
done

This User Gave Thanks to kurumi For This Post:
pulsorock
# 7  
Old 03-31-2011
If no files match $file will be "*.flv"

This will be better (also weeds out any directories or special files with a .flv suffix):

Code:
for f in *$OLD_EXT; do
  [ -f "$file" ] || continue
  ....
  echo "Old File: " $f
  echo "New File: " $NEW_FILE
  .....
done

This User Gave Thanks to Chubler_XL For This Post:
pulsorock
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