## Define wrapper functions with absolute paths.
##
## Example:
##   - On SunOS use ggrep from /usr/sfw/bin as grep.
##     use SunOS /usr/sfw/bin ggrep=grep

use ()
{
  local sys=$1; shift
  local path=$1; shift
  local def
  local file
  local func
  if [ "$(uname -s)" = "$sys" ]; then
    for def; do
      IFS== read -r file func <<<"$def"
      path=$path/$file
      if [ -x $path ]; then
        eval "${func:-$file} () { $path \"\$@\"; }"
      else
        echo "$0: ERROR: Missing: $path" >&2
      fi
    done
  fi
}