如何在 bash 中快速测试路径以确定其中的任何部分是否是符号链接？

Question

如果我有这样的带有符号链接的路径：

/this/one/two/three

有没有快速的一行代码可以确定路径中是​​否有其他段是符号链接？例如，我想检测这，一，二， 或者三上面的例子中是一个符号链接。

一种方法是将包含符号链接的路径与 的输出进行比较readlink -f <path>。想知道是否有更快的方法。

Answer 1

我会用：

if [[ "$my_path" != "$(realpath --canonicalize-existing $my_path)" ]];then
  echo The path $my_path is relative path or contains symlinks.
else
  echo The path $my_path is absolute.
fi

Answer 2

您可以在这种情况下或其他情况下使用awk和print使用，它非常简单和有用。在这种情况下，您可以执行以下步骤：1 =打开〜/ .bashrc并在该文件末尾添加以下命令

alias issymlink="sh /bin/issymlink.sh $1"

2 = 创建一个包含以下内容的文件/bin/issymlink.sh

#!/bin/bash
path=$1
type=`stat $1 | awk 'FNR == 2 {print $8;}'`

if [ $type != "symbolic" ]
then
  echo The path $1 is absolute and type of this path is $type
else
  echo The path $1 is symlinks.
fi

3 - 注销并登录或输入su终端并输入最后你可以输入issymlink PATH/TO/FILE/OR/DIRECTORY终端并输入来检查文件类型

示例用法和输出：

issymlink /lib
The path /lib is absolute and type of this path is directory

issymlink /etc/nginx/sites-enabled/default
The path /etc/nginx/sites-enabled/default is symlinks.

Answer 3

从：https://unix.stackexchange.com/questions/96907/how-do-i-check-if-a-file-is-a-symbolic-link-to-a-directory

我们看到了什么？[[ -L ]]——为我们完成这项工作。干杯。

# cat script.sh 
#!/bin/bash

/bin/rm -vfr this
/bin/mkdir -vp this/one/two/three

/bin/mv -v this/one/two/three this/one/two/real_three
/bin/ln -vfs real_three this/one/two/three
/bin/ls -altr  this/one/two/

/bin/mv -v this/one/two this/one/real_two
/bin/ln -vfs real_two this/one/two
/bin/ls -altr  this/one/two/
/bin/ls -altr  this/one/

tmp="this/one/two/three"

while [ "$tmp" != "." ]; do
        if [ -L "$tmp" ]; then
                /bin/echo "$tmp - is symlink."
        else
                /bin/echo "$tmp - is not symlink."
        fi
        tmp=$(/bin/dirname $tmp)
done

用法：

# bash script.sh 
removed 'this/one/two'
removed directory 'this/one/real_two/real_three'
removed 'this/one/real_two/three'
removed directory 'this/one/real_two'
removed directory 'this/one'
removed directory 'this'
/bin/mkdir: created directory 'this'
/bin/mkdir: created directory 'this/one'
/bin/mkdir: created directory 'this/one/two'
/bin/mkdir: created directory 'this/one/two/three'
renamed 'this/one/two/three' -> 'this/one/two/real_three'
'this/one/two/three' -> 'real_three'
total 12
drwxr-xr-x 2 root root 4096 Aug  8 20:08 real_three
drwxr-xr-x 3 root root 4096 Aug  8 20:08 ..
lrwxrwxrwx 1 root root   10 Aug  8 20:08 three -> real_three
drwxr-xr-x 3 root root 4096 Aug  8 20:08 .
renamed 'this/one/two' -> 'this/one/real_two'
'this/one/two' -> 'real_two'
total 12
drwxr-xr-x 2 root root 4096 Aug  8 20:08 real_three
lrwxrwxrwx 1 root root   10 Aug  8 20:08 three -> real_three
drwxr-xr-x 3 root root 4096 Aug  8 20:08 .
drwxr-xr-x 3 root root 4096 Aug  8 20:08 ..
total 12
drwxr-xr-x 3 root root 4096 Aug  8 20:08 ..
drwxr-xr-x 3 root root 4096 Aug  8 20:08 real_two
lrwxrwxrwx 1 root root    8 Aug  8 20:08 two -> real_two
drwxr-xr-x 3 root root 4096 Aug  8 20:08 .
this/one/two/three - is symlink.
this/one/two - is symlink.
this/one - is not symlink.
this - is not symlink.