Add subversion rev number in committed file

Hello,
Does someone know if it is possible to add the subversion revision
number in committed files?

I have tried to use a pre-commit hook script. I succeed to extract the
revision number (by using svnlook) and the list of updated/added files,
but I don't knows how to modify the "committed" files with the extracted
revision number before termination of the commit action.

Here is the (pre-commit) script I have written:
------------------------------------------------------------------------

---
#!/bin/sh
REPOS="$1"
TXN="$2"
SVNLOOK=/usr/bin/svnlook
commit_list=`$SVNLOOK changed  -t $2 $1`
prev_word=""
new_commit_list=""
for word in $commit_list
do
 # only Added and Updated files are taken into account
  if [ "$prev_word" = "A" ] || [ "$prev_word" = "U" ]
 then
   # only .c and .h should be processed
    if [ ${word#*.} = "c" ] || [ ${word#*.} = "h" ]  
    then
      new_commit_list="$new_commit_list $repos/$word"
    fi
  fi
  prev_word=$word
done
for word in $new_commit_list
do
  cp $word /tmp
 /bin/sed "s/^-- VERSION:.*/-- VERSION: $vers/" /tmp/`basename $word` >
$word
done
------------------------------------------------------------------------
---
Kind regards,

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