The way rename works is rename s/old/new/. The period stands for any character. If you precede the period with a backslash, it means a literal period. The dollar sign means the end of the string (there can be nothing after it, so m4b, not m4b*).

Rename is described here

Changing Extensions#


In Linux, for example, to rename *.m4b -> *.m4a

First, to see what will happen,

$ rename -n 's/\.m4b$/\.m4a/' *.m4b

then, if the results are satisfactory, run again without the -n extension.


On Mac, the rename command doesn't exist. You can type following however to convert *.txt to *.xml

for i in *.txt; do base=`basename "$i" .txt`; mv "$i" "$base".xml;done

Stripping from the front of the file name#

iTunes sometimes puts the track number twice. You end up with filenames like

01 01 Lord Hornblower.mp3
2-01 01 Post Captain.m4b

To fix this, run

$ rename 's/.. //' *.mp3
you will get
01 Lord Hornblower.mp3
2-01 01 Post Captain.m4b
What it actually does is strip the first space and two preceding characters. So in "2-01 01", the first 01 and the following space are removed and the second 01 moves into its place.

Change %20 to space in filenames#

$ rename 's/.20/ /g' *mp3

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