linux - 如何检查 shell 脚本中的两个变量是否指向同一个文件夹？

Question

如何判断一个shell脚本中的两个变量是否指向同一个文件夹？

不能仅通过比较这些变量来检查:

d1=/home/
d2=/home/user/../

if [ "$d1" == "$d2" ]
then
    echo true
else
    echo false
fi

... outputs false

让我们假设:d1 和d2 都是文件系统上的目录路径，并且指向同一个目录。然而，它们的写法不同，如 /home/ 和 /home/user/../。因此，简单检查相等字符串在这里不起作用。

---

受问题启发:

1. A reliable way to check if two variables in a cmd shell point to the same folder

在答案中:

for %%A in ("%d1%") do for %%B in ("%d2%") do if "%%~fA"=="%%~fB" (echo true) else (echo false)

Answer 1

var1="/home/ps/temp/.."
var2="/home/ps/"


if [ "$(readlink -f "$var1")" == "$(readlink -f "$var2")" ];then
    echo "they are pointing to same directory...."

else

    echo "NOOOOO they are different"

fi

来自 man readlink :

-f, --canonicalize

canonicalize by following every symlink in every component of the given name recursively; all but the last component must exist