我想要一组只读的文档，因此我这样做：
cd ~
chmod --recursive a-w Documents
为什么只有最顶层目录的图标显示“锁”图标覆盖？
> cd ~
> ls -l
total 7688
-rw-rw-r-- 1 roger roger 4127692 Dec 6 14:09 Backup.log
drwxrwxr-x 2 roger roger 4096 Dec 24 19:48 Backups
drwxr-xr-x 2 roger roger 4096 Jan 9 00:28 Desktop
dr-xr-xr-x 21 roger roger 4096 Jan 8 20:24 Documents
drwxr-xr-x 2 roger roger 4096 Jan 8 02:38 Downloads
drwxrwxr-x 5 roger roger 4096 Dec 7 14:07 Jts
drwxrwxr-x 5 roger roger 4096 Dec 6 13:55 programs
drwxr-xr-x 2 roger roger 4096 Jan 2 2016 Public
drwxrwxr-x 2 roger roger 4096 Dec 7 03:17 restore
drwxr-xr-x 2 roger roger 4096 Jan 11 2016 Templates
drwxrwxr-x 3 roger roger 4096 Jan 2 2016 VirtualBox VMs
drwxrwxr-x 3 roger roger 4096 Nov 26 17:42 WindowsBackup
-rw-rw-r-- 1 roger roger 3691022 Nov 26 17:52 WindowsBackup.log
drwxrwxr-x 2 roger roger 4096 Nov 26 18:46 WindowsBackups
> cd Documents
> ls -l
total 92
dr-xr-xr-x 4 roger roger 4096 Dec 2 17:33 bashscripts
dr-xr-xr-x 2 roger roger 4096 Oct 28 15:14 discard
dr-xr-xr-x 35 roger roger 4096 Dec 7 00:53 doc
dr-xr-xr-x 5 roger roger 4096 Oct 8 2013 ib
dr-xr-xr-x 7 roger roger 4096 Feb 7 2016 jppf3
dr-xr-xr-x 5 roger roger 4096 Mar 9 2016 jppf5
dr-xr-xr-x 5 roger roger 4096 Oct 10 22:27 jppf5e
dr-xr-xr-x 3 roger roger 4096 Sep 4 20:35 ohana1Deployment
dr-xr-xr-x 3 roger roger 4096 Jun 28 2012 pyUtil
dr-xr-xr-x 3 roger roger 4096 Apr 18 2016 rangeTest
dr-xr-xr-x 6 roger roger 4096 May 4 2016 run140domains
dr-xr-xr-x 3 roger roger 4096 Apr 15 2016 run5domains
dr-xr-xr-x 6 roger roger 4096 Dec 3 2014 sandbox
dr-xr-xr-x 3 roger roger 20480 Jun 25 2016 sandboxDomains
dr-xr-xr-x 8 roger roger 4096 Feb 5 2016 smallPrograms
dr-xr-xr-x 4 roger roger 4096 Oct 28 15:13 systemDrivers
dr-xr-xr-x 2 roger roger 4096 Nov 28 21:17 validator
dr-xr-xr-x 4 roger roger 4096 Mar 10 2015 website
dr-xr-xr-x 14 roger roger 4096 Jan 8 20:51 workspace
需要注意的是，chmod在较低级别应用不会对相关图标产生影响。例如，以下内容对 图标没有影响doc。
> cd ~/Documents
> chmod --recursive a-w doc