Unix 终端，“cd .."对于特定数量的目录 [英] Unix terminal, "cd .." for a specific number of directories

问题描述

假设我们有这样的目录结构:

Let's suppose we have this directory structure:

/home/myuser/dir_1/sub_1/sub_2/sub_3

而我想从sub_3遍历到dir_1，我需要做的是

and I want to traverse from sub_3 to dir_1, what I need to do is

cd ../../..

我的问题是，没有更短的吗?我的意思是:

My question is, isn't there something shorter? I mean something like:

cd -t 3

你可以在哪里告诉 shell 你想要返回多少个目录.

where you can tell the shell how many directories you want to go back.

推荐答案

使用 printf 然后 cd 构建路径:

Build the path using printf then cd to it:

cdup() {
    # $1=number of times, defaults to 1
    local path
    printf -v path '%*s' "${1:-1}"
    cd "${path// /../}"
}

用作:

cdup 4 # to go up four directories
cdup 1 # to explicitly go up one directory
cdup   # to implicitly go up one

具有 cd 被调用一次的良好属性，无论 N 有多大.

Has the nice property that cd is called once, regardless of how big N is.

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