如何删除除最后 2 个目录之外的所有目录以及指向这些目录的符号链接

Question

I have below directory structure.

~/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/

How to keep or preserve only the last two directories which are modified recently including the symlinks and their respective directories pointed to them?

I have tried the below

~/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

but that one is even deleting the directories pointing to symlink , keeping only the broken symlink.

#!/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

Expected results are

~/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

The release4/ shouldn't get deleted which points to symlink and the symlink too. Any help Thanks.

Answer 1

Assumptions:

You want to retain only the two directories last modified.
You do not want to remove symlinks at all.

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

This will not address symlinks at all, though we could add that if you want it. The same is true for plain files, etc.

... Don't parse ls

Answer 2

SKIP="$(readlink Current@)";ls -trd release*|grep -v "^$SKIP$"|head -n -1|while read f;do rm -rf rela* "$f";done

EDIT 2:

The OP changed the specification slightly: There are also other directories.

18.09/ 19.01/ 19.02/ 19.03/ 19.05/ 19.04/

I slightly changed the "one liner" to capture also THIS:

[user123@matrix app1]$ mkdir 18.09/ 19.01/ 19.02/ 19.03/ 19.05/ 19.04/
[user123@matrix app1]$ ls -ltr
insgesamt 28
drwxrwxr-x. 2 user123 user123 4096 19. Apr 14:16 release4
lrwxrwxrwx. 1 user123 user123    8 19. Apr 14:18 Current@ -> release4
-rw-rw-r--. 1 user123 user123    0 20. Apr 01:45 1
drwxrwxr-x. 2 user123 user123 4096 20. Apr 01:48 19.05
drwxrwxr-x. 2 user123 user123 4096 20. Apr 01:48 19.04
drwxrwxr-x. 2 user123 user123 4096 20. Apr 01:48 19.03
drwxrwxr-x. 2 user123 user123 4096 20. Apr 01:48 19.02
drwxrwxr-x. 2 user123 user123 4096 20. Apr 01:48 19.01
drwxrwxr-x. 2 user123 user123 4096 20. Apr 01:48 18.09
[user123@matrix app1]$ SKIP="$(readlink Current@)";ls -tr|egrep -v "^$SKIP$|^Current@$"|head -n -1|while read f;do rm -rf "$f";done
[user123@matrix app1]$ ls -l
insgesamt 8
drwxrwxr-x. 2 user123 user123 4096 20. Apr 01:48 18.09
lrwxrwxrwx. 1 user123 user123    8 19. Apr 14:18 Current@ -> release4
drwxrwxr-x. 2 user123 user123 4096 19. Apr 14:16 release4
[user123@matrix app1]$