删除断开的链接 Unix [英] Deleting a broken link Unix

问题描述

我想删除一个断开的链接，但在此之前我想确认链接文件是否存在于目录中.让我们调用链接A:

I want to delete a broken link, but before that I want to confirm if the link file is present in directory. Let's call the link A:

if [ -a A ] then 
  print 'ya A is ther'
fi

但是如果 A 是一个断开的链接，那么我该如何检查?

But if A is a broken link then how can I check?

推荐答案

find -L -type l 查找损坏的符号链接.首先使用 test -d 确认该文件不是目录或指向目录的符号链接(如果它是目录，find 会递归进入该目录).因此:

find -L -type l finds broken symbolic links. First confirm that the file is not a directory or a symbolic link to a directory with test -d (if it's a directory, find would recurse into it). Thus:

is_broken_symlink () {
    case $1 in -*) set "./$1";; esac
    ! [ -d "$1" ] && [ -n "$(find -L "$1" -type l)" ]
}

如果test 调用和find 调用之间的链接发生变化，这很容易出现竞争条件.另一种方法是告诉 find 不要递归.

This is prone to a race condition, if the link changes between the call to test and the call to find. An alternative approach is to tell find not to recurse.

is_broken_symlink () {
    case $1 in -*) set "./$1";; esac
    [ -n "$(find -L "$1" -type l -print -o -prune)" ]
}

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