sed - removing/renaming file extensions.

Capt'n Midnight

No response in OS. so posting it here..

I want to copy files into a folder, but if a file of the name already exists I want to rename one of them so I get Filename_X.EXT where X is the next number.

I can remove file extensions by
dir | sed s\...$\\ but I need to use the extension later on too.

Should I be able to use sed h.....$ to store the extension and then append it later ?


I could use sed to reverse the string, then use FOR (Windows command line) to remove everything up to the first dot and then use sed to reverse the three characters, but that would just be stupid if there is an easier way.

I could also just process one file type at a time, but would rather a generic way.

sed scripts I've looked at
http://sed.sourceforge.net/sed1line.txt
http://www.student.northpark.edu/pemente/sed/sedfaq.html

PhantomBeaker

Um, my way is probably needlessly complex, but I have a script for ripping cds - cdparanoia which names tracks "track[0-9][0-9].mp3" which I then want to rename to [0-9][0-9].mp3

There are a coupla other things I use. So what I do is I surround the bit that I want to match, but keep in escaped brackets

i.e. s/\(basename\)\(.ext\)$/\1\2 \2/g would turn out

basename.ext .ext

The \1 and \2 refer to the atoms you surrounded with escaped parentheses. \1 to the first one, \2 to the second... I'm sure you get the picture. So that way you can keep it.

Hope that helps you with what you wanna do

Catch_22

if i had to do this i would use awk, but then again i wouldnt be stuck using windows :P
so id be able to wtite a regular little shell script as below, but you can get shells for
windows so this might help
( i just typed this in a quick rush so i assume there is typos etc...)

for file in <all files>
do
name=`echo $file |awk -F'.'. '{print $1}'
ext=`echo $file |awk -F'.'. '{print $2}'

if [ ! -f $dest/$name.$ext ]; then
cp $file $dest/$name.$ext
else
a=0
done=0
while [ $done -eq 0 ]; do
if [ ! -f $name_$a.$ext ]; then
cp $file $dest/$name_$a.$ext
done=1
else
a=`expr $a + 1`
fi
done
fi
done


Edit: grrr thats alll nicely indented in the bloody edit window, ah well .....

Capt'n Midnight

Catch_22 wrote:

[php]
for file in <all files>
do
name=`echo $file |awk -F'.'. '{print $1}'
ext=`echo $file |awk -F'.'. '{print $2}'

if [ ! -f $dest/$name.$ext ]; then
cp $file $dest/$name.$ext
else
a=0
done=0
while [ $done -eq 0 ]; do
if [ ! -f $name_$a.$ext ]; then
cp $file $dest/$name_$a.$ext
done=1
else
a=`expr $a + 1`
fi
done
fi
done
[/php]

. Just added [ php ] tags - it looks better now , thanks.

http://gnuwin32.sourceforge.net/packages/gawk.htm