考虑这一点(source)：

#!/bin/bash
dir_resolve()
{
cd "$1" 2>/dev/null || return $?  # cd to desired directory; if fail,quell any error messages but return exit status
echo "`pwd -P`" # output full,link-resolved path
}

# sample usage
if abs_path="`dir_resolve \"$1\"`"
then
echo "$1 resolves to $abs_path"
echo pwd: `pwd` # function forks subshell,so working directory outside function is not affected
else
echo "Could not reach $1"
fi