Jan Kończak

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Keep in mind that programs such as ''ls'' or ''stat'' display the permissions
exactly the same regardless if the user that ran them is the owner or not,
belongs to the group whose the file is or not. One has to tell apart manually
which chunk of permissions to look at.
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<pre>
<span class="wU">roo</span>@<span class="wH">host</span><span class="wD"> /tmp $</span> whoami
<span class="wS">roo</span>
<span class="wU">roo</span>@<span class="wH">host</span><span class="wD"> /tmp $</span> groups
bipedal jumping
<span class="wU">roo</span>@<span class="wH">host</span><span class="wD"> /tmp $</span> ls -l
total 4
d<span class="wP">rwx</span>r-x--x 5 <span class="wS">roo</span> jumping 160 Mar 16 20:04 myDir
-<span class="wP">rw-</span>---r-- 1 <span class="wS">roo</span> jumping 249 Mar 16 20:03 someFile
<span class="wU">roo</span>@<span class="wH">host</span><span class="wD"> /tmp $</span> stat myDir
  File: myDir
  Size: 160     Blocks: 0         IO Block: 4096   directory
Device: 0,30    Inode: 90         Links: 5
Access: (0<span class="wP">7</span>51/d<span class="wP">rwx</span>r-x--x)  Uid: (1234/  <span class="wS">roo</span>)  Gid: (123/ jumping)
<span class="wU">roo</span>@<span class="wH">host</span><span class="wD"> /tmp $</span> stat someFile
  File: someFile
  Size: 249     Blocks: 8         IO Block: 4096   regular file
Device: 0,30    Inode: 91         Links: 1
Access: (0<span class="wP">6</span>04/-<span class="wP">rw-</span>---r--)  Uid: (1234/  <span class="wS">roo</span>)  Gid: (123/ jumping)
</pre>
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The user ''roo'' is the owner of the file, so for the user **only** the first chunk matters.

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<pre>
<span class="wU">tigger</span>@<span class="wH">host</span><span class="wD"> /tmp $</span> whoami
<span class="wN">tigger</span>
<span class="wU">tigger</span>@<span class="wH">host</span><span class="wD"> /tmp $</span> groups
<span class="wS">jumping</span> happy
<span class="wU">tigger</span>@<span class="wH">host</span><span class="wD"> /tmp $</span> ls -l
total 4
drwx<span class="wP">r-x</span>--x 5 <span class="wN">roo</span> <span class="wS">jumping</span> 160 Mar 16 20:04 myDir
-rw-<span class="wP">---</span>r-- 1 <span class="wN">roo</span> <span class="wS">jumping</span> 249 Mar 16 20:03 someFile
<span class="wU">tigger</span>@<span class="wH">host</span><span class="wD"> /tmp $</span> stat myDir
  File: myDir
  Size: 160     Blocks: 0         IO Block: 4096   directory
Device: 0,30    Inode: 90         Links: 5
Access: (07<span class="wP">5</span>1/drwx<span class="wP">r-x</span>--x)  Uid: (1234/  <span class="wN">roo</span>)  Gid: (123/ <span class="wS">jumping</span>)
<span class="wU">tigger</span>@<span class="wH">host</span><span class="wD"> /tmp $</span> stat someFile
  File: someFile
  Size: 249     Blocks: 8         IO Block: 4096   regular file
Device: 0,30    Inode: 91         Links: 1
Access: (06<span class="wP">0</span>4/-rw-<span class="wP">---</span>r--)  Uid: (1234/  <span class="wN">roo</span>)  Gid: (123/ <span class="wS">jumping</span>)
</pre>
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The user ''tigger'' is **not** the owner of the file,
but is in group ''jumping'' whose the file is, 
so for the user **only** the middle chunk matters.

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<pre>
<span class="wU">eeyore</span>@<span class="wH">host</span><span class="wD"> /tmp $</span> whoami
<span class="wN">eeyore</span>
<span class="wU">eeyore</span>@<span class="wH">host</span><span class="wD"> /tmp $</span> groups
<span class="wG">quadruped</span> <span class="wG">glum</span>
<span class="wU">eeyore</span>@<span class="wH">host</span><span class="wD"> /tmp $</span> ls -l
total 4
drwxr-x<span class="wP">--x</span> 5 <span class="wN">roo</span> <span class="wG">jumping</span> 160 Mar 16 20:04 myDir
-rw----<span class="wP">r--</span> 1 <span class="wN">roo</span> <span class="wG">jumping</span> 249 Mar 16 20:03 someFile
<span class="wU">eeyore</span>@<span class="wH">host</span><span class="wD"> /tmp $</span> stat myDir
  File: myDir
  Size: 160     Blocks: 0         IO Block: 4096   directory
Device: 0,30    Inode: 90         Links: 5
Access: (075<span class="wP">1</span>/drwxr-x<span class="wP">--x</span>)  Uid: (1234/  <span class="wN">roo</span>)  Gid: (123/ <span class="wG">jumping</span>)
<span class="wU">eeyore</span>@<span class="wH">host</span><span class="wD"> /tmp $</span> stat someFile
  File: someFile
  Size: 249     Blocks: 8         IO Block: 4096   regular file
Device: 0,30    Inode: 91         Links: 1
Access: (060<span class="wP">4</span>/-rw----<span class="wP">r--</span>)  Uid: (1234/  <span class="wN">roo</span>)  Gid: (123/ <span class="wG">jumping</span>)
</pre>
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The user ''eeyore'' is **not** the owner of the file,
**neither** he is in group ''jumping'' whose the file is, 
so for the user **only** the last chunk matters.
Jan Kończak

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