文件权限：为什么我不能列出目录？
我能够在根shell中列出目录，
root@ThinkPad:~# ll /media/ total 36 drwxr--r-- 6 root root 4096 2011-05-12 16:41 ./ drwxr-xr-x 22 root root 4096 2011-05-12 13:14 ../ drwxr-xr-x 5 root root 4096 2011-05-12 15:56 hd/ drwxr--r-- 2 root root 16384 2011-05-12 14:20 lost+found/ drwxr-xr-x 5 root root 4096 2011-05-12 16:34 main/ drwxr--r-- 4 root root 4096 2011-05-12 16:41 .Trash-0/ 但不是来自我的用户帐户：
alex@ThinkPad:~$ ll /media/ ls: cannot access /media/..: Permission denied ls: cannot access /media/hd: Permission denied ls: cannot access /media/lost+found: Permission denied ls: cannot access /media/.Trash-0: Permission denied ls: cannot access /media/.: Permission denied ls: cannot access /media/main: Permission denied total 0 d????????? ? ? ? ? ? ./ d????????? ? ? ? ? ? ../ d????????? ? ? ? ? ? hd/ d????????? ? ? ? ? ? lost+found/ d????????? ? ? ? ? ? main/ d????????? ? ? ? ? ? .Trash-0/
我不明白为什么我看不到文件（ /media有+ r权限）。
为了能够“输入”目录，这是列出其内容的先决条件，您还需要+ x权限。
另请注意，这是从目录结构的顶部（根）一直需要的。 为了能够进入/ foo / bar / baz目录，用户需要对每个中间目录具有+ x权限。
我使用我的pathlld脚本。 pathlld是：
#!/bin/bash # Show the permissions on all the directories leading from / to # the parameter. # Usage: $0 <...> # # $Header: /home/walt/bin/RCS/pathlld,v 1.4 2010/02/21 20:34:16 walt Exp $ # # function pathlld () { if [ "$1" = "/" ] ; then /bin/ls -ld / else parent="${1%/*}" pathlld "${parent:-/}" /bin/ls -ld "$1" fi } force=0 if [ "$1" = "-f" ] ; then force=1 shift fi # Make sure we got at least one filename or directory name file_or_dir="$1" file_or_dir="${file_or_dir:?'missing.'}" while [ $# -ne 0 ] ; do if [ $force -eq 1 -o -e "$1" ] ; then case "$1" in /* ) target="$1" ;; * ) target="$PWD/$1" ;; esac pathlld "$target" [ -L "$target" ] && /bin/ls -ldL "$target" else echo "Nonexistent file or directory: $1" fi shift done
它不会检测以只读方式mount文件系统，请使用mount 。