为什么这个符号链接创建两个实例 [英] Why is this symbolic link created two instances

问题描述

我用我的点文件的安装脚本。我使用创建一个目录来我家的文件夹符号链接。在执行环节天晴，但第二symobolic创建链接，我不能的原因。

I have an install script used for my dotfiles. I am using to create symbolic links of one directory to my home folder. The links execute fine apart but a second symobolic link is created and I cannot reason why.

在项目的文件夹结构看起来像这样

The folder structure in the project looks like this

install.sh
scripts/
    shell.sh
shell/

install.sh 要求 shell.sh 和调用命令

ln -s $SCRIPTS_DIR/shell/ $HOME/.shell

$ SCRIPTS_DIR是全路径

$SCRIPTS_DIR is a full path

所以，我得到我的主目录.shell目录链接就好了，但现在我的项目文件夹中有一个额外的符号链接

So I do get a .shell directory in my home directory linked just fine but now my project folder has an extra symbolic link

install.sh
scripts/
    shell -> PATH_TO_PROJECT/shell
    shell.sh 
shell/

任何解释会被AP preciated

Any explanation would be appreciated

推荐答案

想想，当你运行 LN -S 命令两次当它的目标是一个目录，而会发生什么比文件

Think about what happens when you run the ln -s command twice when its target is a directory rather than a file.

如果 $ HOME / .shell 不存在，那么

ln -s "$SCRIPTS_DIR/shell/" "$HOME/.shell"

...创建它。但是，如果它的已的存在，那么......

...creates it. However, if it already exists, then...

ln -s "$SCRIPTS_DIR/shell/" "$HOME/.shell"

...对待 .shell 作为目的地目录名，要创建不到目的地的完整路径，和内 EM>该目录中。

...treats .shell as a destination directory name, not a complete path to the destination to be created, and creates a new entry within that directory.

GNU LN 有一些扩展来解决这个使用情况，包括：

GNU ln has some extensions to fix this usage, including:

-h如果TARGET_FILE或TARGET_DIR是一个符号链接，不遵循它。这是最有用的-f选项，以取代可能指向目录的符号链接。

-h If the target_file or target_dir is a symbolic link, do not follow it. This is most useful with the -f option, to replace a symlink which may point to a directory.

因此​​，如果一个GNU系统上运行时，可以使用：

Thus, if operating on a GNU system, you could use:

# quotes added for bash compatibility, since question is tagged for both shells
ln -sfh "$SCRIPTS_DIR/shell/" "$HOME/.shell"

---

否则，只需先检查一下：

---

Otherwise, just check first:

[[ -e $HOME/.shell ]] || ln -s "$SCRIPTS_DIR/shell/" "$HOME/.shell"

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