//View Tip #544
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This tip is inspired by #27 ( http://www.shell-fu.org/lister.php?id=27 ) which I think is misleading, here's a much more reliable and efficient version:

rename_ext() {
   local filename
   for filename in *."$1"; do
     mv "$filename" "${filename%.*}"."$2"

use it like:

rename_ext php html

to rename all .php files to .html in the current directory.

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That looks wonderfully useful.  Could you explain what % does in this case?  "man bash" hurt my brain.
Posted 2009-02-24 20:38:06
user@host$ man bash
         The word is expanded to produce a pattern  just  as  in
         pathname  expansion.  If the pattern matches a trailing
         portion of the expanded value of  parameter,  then  the
         result of the expansion is the expanded value of param-
         eter with the  shortest  matching  pattern  (the  ``%''
         case) or the longest matching pattern (the ``%%'' case)
         deleted.  If parameter is @ or *, the  pattern  removal
         operation  is  applied  to each positional parameter in
         turn, and the expansion  is  the  resultant  list.   If
         parameter is an array variable subscripted with @ or *,
         the pattern removal operation is applied to each member
         of  the  array in turn, and the expansion is the resul-
         tant list.
Posted 2009-02-25 13:55:42
Cool function, thanks!
The only thing I would change here is the file list:
function chext()
 local fname
 local new_ext="$1"
 for fname in $@
   mv "$fname" "${fname%.*}.$new_ext"

And the usage would be:
chext new_ext *.old_ext
Posted 2009-02-25 14:26:25

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