pushpop

linux脚本编程的例子

pushd ()
{
    dirname=$1
    DIR_STACK="$dirname ${DIR_STACK:-$PWD' '}"
    cd ${dirname:?"missing directory name."}
    echo "$DIR_STACK"
}

popd ()
{
    DIR_STACK=${DIR_STACK#* }
    cd ${DIR_STACK%% *}
    echo "$PWD"
}