linux - 如何删除除最后 2 个目录以及指向这些目录的符号链接(symbolic link)之外的所有目录

Question

我有以下目录结构。

~/test_dir🍺$ls -lrt
total 8
drwxr-xr-x  5 kk  Users   160B Apr 17 23:53 app1/
drwxr-xr-x  5 kk  Users   160B Apr 17 23:53 app2/
drwxr-xr-x  5 kk  Users   160B Apr 17 23:53 app3/
drwxr-xr-x  5 kk  Users   160B Apr 17 23:53 app4/
drwxr-xr-x  5 kk  Users   160B Apr 17 23:53 app5/

~/test_dir🍺$cd app1

~/test_dir/app1🍺$ls -rlt
total 0
drwxr-xr-x  2 kk  10677    64B Apr 19 14:16 release1/
drwxr-xr-x  2 kk  10677    64B Apr 19 14:16 release2/
drwxr-xr-x  2 kk  10677    64B Apr 19 14:16 release3/
drwxr-xr-x  2 kk  10677    64B Apr 19 14:16 release4/
drwxr-xr-x  2 kk  10677    64B Apr 19 14:17 release5/
drwxr-xr-x  2 kk  10677    64B Apr 19 14:17 relase23/
drwxr-xr-x  2 kk  10677    64B Apr 19 14:17 release8.9/
lrwxr-xr-x  1 kk  10677     8B Apr 19 14:18 Current@ -> release4

~/test_dir🍺ls -t1 | tail -n +3 | grep -v Current
relase23/
release5/
release4/
release3/
release2/
release1/

如何保留或保留最近修改的最后两个目录，包括符号链接(symbolic link)及其指向它们的各自目录？

我已经尝试过以下方法

~/test_dir🍺ls -t1 | tail -n +3 | grep -v Current 
relase23/
release5/
release4/
release3/
release2/
release1/

~/test_dir/app1🍺$ls -t1 | tail -n +3 | grep -v Current | xargs rm -r
~/test_dir/app1🍺$ls -rlt
total 0
drwxr-xr-x  2 kk  10677    64B Apr 19 14:17 release8.9/
lrwxr-xr-x  1 kk  10677     8B Apr 19 14:18 Current@ -> release4

但那个甚至删除了指向符号链接(symbolic link)的目录，只保留损坏的符号链接(symbolic link)。

#!/bin/bash
array=("app1" "app2" "app3" "app4" "app5")

for ((i=0;i<${#array[@]};i++))
do
app=${array[$i]}
echo "the app dir name is: $app"
cd ~/test_dir/$app
count=$(ls -t1 | tail -n +4 | grep -v Current | wc -l)
echo "number of directories deleted are:"
if [ $count == 0 ]
then
echo "Nothing to delete"
echo " "
else
ls -t1 | tail -n +4 | grep -v Current| xargs rm -r
fi
done
exit

预期结果为

~/test_dir/app1🍺$ls -t1 | tail -n +3 | grep -v Current | xargs rm -r
~/test_dir/app1🍺$ls -rlt
total 0
drwxr-xr-x  2 kk  10677    64B Apr 19 14:16 release4/
drwxr-xr-x  2 kk  10677    64B Apr 19 14:17 release8.9/
lrwxr-xr-x  1 kk  10677     8B Apr 19 14:18 Current@ -> release4

release4/不应该被删除，它也指向符号链接(symbolic link)和符号链接(symbolic link)。任何帮助谢谢。

Answer 1

假设:

您只想保留最后修改的两个目录。
您根本不想删除符号链接(symbolic link)。

kept=0
stat -c "%Y %n %F" * | sort -rn |
while read timestamp dir type
do [[ directory == "$type" ]] || continue
   ls -ld $dir/ # for logging only 
   if (( kept++ < 2 ))
   then echo "Keeping $dir"
   else echo "Removing $dir"
        rm -fr $dir
   fi
done

这根本不会解决符号链接(symbolic link)问题，尽管如果您需要的话我们可以添加它。对于普通文件等也是如此。

... Don't parse ls