title: Finding all directories that are world readable
body: <p>**I cannot use find as I get a permission denied error</p>
  
  <p>I am trying to find all the directories in /students that are world readable. This is what I have so far:</p>
  
  <pre><code>grep 'r-x' | cut -c8-10 | ls -l /students | sort | uniq -c
  </code></pre>
  
  <p>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!</p>
  
  <p>For some reason it's pulling out more than just the directories readable by others.</p>
  
  <p>Here is some sample output (I omitted the majority of the output)</p>
  
  <pre><code>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
  </code></pre>