#!/bin/bash
tag=$1
file=""
revision=""
cvs -q log 2>/dev/null | grep -E "(Working file: |$tag)" | grep -B1 $tag |
  while read line; do
    if [[ $line == Working\ file:\ * ]]; then
      file=$(echo $line | sed "s/Working file: //")
    elif [[ $line == $tag* ]]; then
      revision=$(echo $line | sed "s/$tag: //")
    fi
    if [ "$file" != "" -a "$revision" != "" ]; then
      echo cvs update -r$revision $file
      file=""
      revision=""
    fi
  done