bash 查找世界可读的所有目录
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Finding all directories that are world readable
提问by Whoppa
**I cannot use find as I get a permission denied error
**我无法使用 find 因为我收到一个权限被拒绝的错误
I am trying to find all the directories in /students that are world readable. This is what I have so far:
我试图在 /students 中找到世界可读的所有目录。这是我到目前为止：
grep 'r-x' | cut -c8-10 | ls -l /students | sort | uniq -c
I don't understand why this is not working. I am telling the shell to search for occurrences of 'r-x'in the 8th-10th characters of ls -l which is other users permissions (hence world readable). Then I'm sorting the output and displaying a count of matching results with uniq -c. This is my understanding of what my shell script should do and I dont see why its not. Any help would be greatly appreciated!
我不明白为什么这不起作用。我告诉 shell 在 ls -l 的第 8-10 个字符中搜索“r-x”的出现，这是其他用户权限（因此世界可读）。然后我对输出进行排序并使用 uniq -c 显示匹配结果的计数。这是我对我的 shell 脚本应该做什么的理解，我不明白为什么不这样做。任何帮助将不胜感激！
For some reason it's pulling out more than just the directories readable by others.
出于某种原因，它提取的不仅仅是其他人可读的目录。
Here is some sample output (I omitted the majority of the output)
这是一些示例输出（我省略了大部分输出）
1 drwx------ 11 lluong b20107 4096 May 26 11:15 lluong
1 drwx------ 23 stretbar b20097 4096 Dec 18 2012 stretbar
1 drwx------ 2 slawson b20003 4096 Mar 2 2013 slawson
1 drwx------ 9 fcunha b20117 4096 May 2 15:21 fcunha
1 drwxrwxrwx 10 jwu131 b20117 4096 Jul 2 19:26 jwu131
1 drwxrwxrwx 14 jadler4 b20127 4096 Oct 11 2012 jadler4
1 drwxrwxrwx 5 rlicudo1 b20067 4096 Apr 3 15:28 rlicudo1
1 drwxrwxrwx 8 lkrubner b20107 4096 Oct 25 2011 lkrubner
1 drwxrwxrwx 9 klau53 b20133 4096 Mar 12 2013 klau53
1 drwxrwx--x 14 vrobins9 b20123 4096 Mar 4 2013 vrobins9
1 drwxr-xr-x 10 aguo3 b20107 4096 Sep 24 00:13 aguo3
1 drwxr-xr-x 10 mdanial b20123 4096 Apr 10 20:46 mdanial
1 drwxr-xr-x 11 49 users 4096 Mar 28 2013 trac
1 drwxr-xr-x 11 rroger12 b20133 4096 May 8 10:00 rroger12
1 drwxr-xr-x 12 spark15 b20113 4096 May 15 2012 spark15
1 drwxr-xr-x 18 lulrich1 b20133 4096 Sep 29 22:36 lulrich1
1 drwxr-xr-x 18 yliu192 b20127 4096 Sep 26 12:19 yliu192
1 drwxr-xr-x 19 dstein b20117 4096 Feb 9 2013 dstein
1 drwxr-xr-x 20 jgarc166 b20127 4096 Sep 12 19:22 jgarc166
1 drwxr-xr-x 2 root root 16384 Nov 15 2007 lost+found
1 drwxr-xr-x 4 jsarno b20113 4096 Dec 7 2011 jsarno
1 drwxr-xr-x 6 btaylo19 b20123 4096 Mar 5 2012 btaylo19
1 drwxr-xr-x 6 dtu b20093 4096 Apr 18 19:18 dtu
1 drwxr-xr-x 6 ewu2 b20133 4096 May 4 14:30 ewu2
1 drwxr-xr-x 6 smeehan b20053 4096 Aug 29 00:19 smeehan
1 drwxr-xr-x 6 ybondar2 b20027 4096 May 23 2012 ybondar2
1 drwxr-xr-x 7 apekar b20103 4096 May 10 00:22 apekar
1 drwxr-xr-x 7 root root 4096 Mar 28 2013 tracprojects
1 drwxr-xr-x 8 jhsiao b20117 4096 Jul 26 17:33 jhsiao
1 drwxr-xr-x 8 xfeng18 b20137 4096 Sep 25 14:42 xfeng18
1 drwxr-xr-x 9 cmendo26 b20133 4096 Aug 19 01:22 cmendo26
1 drwx-----x 8 amissiro b20093 4096 May 12 16:00 amissiro
1 drwx--xr-x 17 apinchuk b20127 4096 May 26 23:03 apinchuk
1 drwx--x--x 10 aboak b20093 4096 Feb 18 2013 aboak
1 drwx--x--x 10 achan123 b20133 4096 Sep 6 21:24 achan123
1 drwx--x--x 10 acurkend b20133 4096 Jul 10 13:15 acurkend
1 drwx--x--x 10 akleinii b20133 4096 Jun 21 09:07 akleinii
1 drwx--x--x 10 akobzar b20133 4096 Sep 26 18:51 akobzar
1 drwx--x--x 10 amainett b20137 4096 Sep 22 11:17 amainett
1 drwx--x--x 10 apewther b20127 4096 Feb 6 2013 apewther
1 drwx--x--x 10 asyrtsov b20127 4096 Aug 16 10:43 asyrtsov
1 drwx--x--x 10 bernst b20135 4096 Sep 23 09:12 bernst
1 drwx--x--x 10 blilley b20123 4096 Apr 20 18:08 blilley
1 drwx--x--x 10 bmckeand b20117 4096 Aug 14 14:17 bmckeand
1 drwx--x--x 10 bsmith18 b20097 4096 Jun 10 11:19 bsmith18
1 drwx--x--x 10 bwilli18 b20117 4096 Nov 6 2012 bwilli18
1 drwx--x--x 10 cbeaton b20123 4096 May 19 04:07 cbeaton
1 drwx--x--x 10 cbeck4 b20137 4096 Sep 29 16:08 cbeck4
1 drwx--x--x 10 cho8 b20093 4096 Mar 24 2013 cho8
1 drwx--x--x 10 cliu58 b20117 4096 Oct 8 2012 cliu58
1 drwx--x--x 10 cmitch21 b20133 4096 Mar 10 2013 cmitch21
1 drwx--x--x 10 cnavarr9 b20127 4096 Apr 30 12:11 cnavarr9
1 drwx--x--x 10 dbienenf b20123 4096 Mar 20 2012 dbienenf
1 drwx--x--x 10 dlau13 b20135 4096 Jul 16 12:15 dlau13
1 drwx--x--x 10 dmok1 b20137 4096 Sep 24 12:50 dmok1
1 drwx--x--x 10 dnou b20133 4096 Apr 23 14:12 dnou
1 drwx--x--x 10 drajabar b20137 4096 Sep 3 20:20 drajabar
1 drwx--x--x 10 drodri12 b20115 4096 Sep 27 17:25 drodri12
1 drwx--x--x 10 ealberto b20113 4096 Dec 18 2012 ealberto
回答by devnull
Rather than parsing ls, use find:
而不是解析ls，使用find：
find /students -perm -o=r
This would list all files and directories in /studentsthat are world readable.
这将列出/students世界可读的所有文件和目录。
If you don't want to recurse into subdirectories and want to find only directories, say:
如果您不想递归进入子目录而只想查找目录，请说：
find /students -maxdepth 1 -type d -perm -o=r
回答by Ignacio Vazquez-Abrams
I am telling the shell to search for occurrences of 'r-x'in the 8th-10th characters of ls -l which is other users permissions (hence world readable).
我告诉 shell 在 ls -l 的第 8-10 个字符中搜索“r-x”的出现，这是其他用户权限（因此世界可读）。
No you're not. You're looking for "r-x" anywhere in the line and then taking the 8th through 10th characters of the lines found.
不你不是。您正在该行中的任何位置查找“rx”，然后获取找到的行的第 8 到第 10 个字符。
find /students -mindepth 1 -maxdepth 1 -type d -perm -005 | ...
回答by Anitha Mani
ls -lR |grep "^d" | cut -c8-10 | grep 'r-x' | sort | uniq -c
ls -lR |grep "^d" | 切-c8-10 | grep 'rx' | 排序 | uniq -c
回答by Dan
ls -lad */ | grep 'r-x' | sort | uniq -c
ls -lad */ | grep 'r-x' | sort | uniq -c
-dis used to list ONLY directories.
*/tells *nix to search ONLY the current directory.
-d用于仅列出目录。
*/告诉 *nix 只搜索当前目录。
