리눅스 채널

realpath 구현

## only Linux
## but FreeBSD exists `realpath' command
##
_realpath()
{
  _PATH=$1
  _CWD=`pwd`

  if [ X"`echo ${_PATH} | grep '^/'`" != "X" ] ;
  then
        _CWD=''
  else
        while [ X"`echo ${_PATH} | grep '^../'`" != "X" ] ;
        do
                _PATH=`echo "${_PATH}" | sed -e 's;^\.\./;;'`
                _CWD=`dirname ${_CWD}`
        done
  fi

  _PATH=`echo "${_CWD}/${_PATH}" | sed -e 's;\./;/;g' -e 's;//;/;g' -e
's;/$;;'`
  _PATH=${_PATH:-/}

  echo -n ${_PATH}
}