Filesystems, Disks and Memory

I have a need to remove a bunch of old user home directories from my
OS X server. Using BASH and ls, I've been able to redirect the directory structure to a file with 'ls -l >userslist'. I've then manually sifted through the list for directories whos owner doesn't match the a given directory name (I'm
sure I could have used grep to filter this for me but hey, that's why I'm here asking questions! I'm new to these tools.)

Anywhoo, what I want to do now is take this list of names and pipe it
into 'rm' to delete them. Which command would read my list line by line to stream into a pipe over to 'rm' to delete each directory? This is a simple one for most UNIX admins I'm sure and I could just do this with the GUI but I'm forcing myself to remove the training wheels.

Any takers? Thanks in advance.

Julius

There are many ways to do this, but here's one. Make sure you
don't run
ls -a > file_list
or there'll be trouble with rm -rf

Code:

# ls -l
total 12
drwxr-xr-x  2 root root 4096 Apr 10 16:04 dir_1
drwxr-xr-x  2 root root 4096 Apr 10 16:04 dir_2
drwxr-xr-x  2 root root 4096 Apr 10 16:04 dir_3
-rw-r--r--  1 root root    0 Apr 10 16:02 file_1
-rw-r--r--  1 root root    0 Apr 10 16:02 file_2
-rw-r--r--  1 root root    0 Apr 10 16:02 file_3
# ls > file_list
# while read file; do
>   [[ -d "${file}" ]] && rm -rf ${file}
> done < ./file_list
# ls -l
total 4
-rw-r--r--  1 root root  0 Apr 10 16:02 file_1
-rw-r--r--  1 root root  0 Apr 10 16:02 file_2
-rw-r--r--  1 root root  0 Apr 10 16:02 file_3
-rw-r--r--  1 root root 49 Apr 10 16:05 file_list
#

Cheers
ZB