linux 文件，目录权限详解

文件：w:只允许修改而不允许删除

目录：w: 允许修改，删除

[root@localhost ~]# cd /

[root@localhost /]# mkdir /prem

[root@localhost /]# ls -ld /prem

drwxr-xr-x 2 root root 4096 Apr 22 01:00 /prem

[root@localhost /]# touch /prem/newfile

[root@localhost /]# ls -l /prem/newfile

-rw-r--r-- 1 root root 0 Apr 22 01:01 /prem/newfile

[root@localhost /]# chmod 777 /prem/newfile

[root@localhost /]# ls -ld /prem

drwxr-xr-x 2 root root 4096 Apr 22 01:01 /prem

[root@localhost /]# ls -l /prem/newfile

-rwxrwxrwx 1 root root 0 Apr 22 01:01 /prem/newfile

[root@localhost /]# cat /etc/paswd

cat: /etc/paswd: No such file or directory

[root@localhost /]# cat /etc/passwd

root:x:0:0:root:/root:/bin/bash

bin:x:1:1:bin:/bin:/sbin/nologin

daemon:x:2:2:daemon:/sbin:/sbin/nologin

adm:x:3:4:adm:/var/adm:/sbin/nologin

lp:x:4:7:lp:/var/spool/lpd:/sbin/nologin

sync:x:5:0:sync:/sbin:/bin/sync

shutdown:x:6:0:shutdown:/sbin:/sbin/shutdown

halt:x:7:0:halt:/sbin:/sbin/halt

mail:x:8:12:mail:/var/spool/mail:/sbin/nologin

news:x:9:13:news:/etc/news:

uucp:x:10:14:uucp:/var/spool/uucp:/sbin/nologin

operator:x:11:0:operator:/root:/sbin/nologin

games:x:12:100:games:/usr/games:/sbin/nologin

gopher:x:13:30:gopher:/var/gopher:/sbin/nologin

ftp:x:14:50:FTP User:/var/ftp:/sbin/nologin

nobody:x:99:99:Nobody:/:/sbin/nologin

distcache:x:94:94:Distcache:/:/sbin/nologin

nscd:x:28:28:NSCD Daemon:/:/sbin/nologin

vcsa:x:69:69:virtual console memory owner:/dev:/sbin/nologin

apache:x:48:48:Apache:/var/www:/sbin/nologin

rpc:x:32:32:Portmapper RPC user:/:/sbin/nologin

mailnull:x:47:47::/var/spool/mqueue:/sbin/nologin

smmsp:x:51:51::/var/spool/mqueue:/sbin/nologin

oprofile:x:16:16:Special user account to be used by OProfile:/home/oprofile:/sbin/nologin

webalizer:x:67:67:Webalizer:/var/www/usage:/sbin/nologin

dovecot:x:97:97:dovecot:/usr/libexec/dovecot:/sbin/nologin

squid:x:23:23::/var/spool/squid:/sbin/nologin

mysql:x:27:27:MySQL Server:/var/lib/mysql:/bin/bash

pcap:x:77:77::/var/arpwatch:/sbin/nologin

ntp:x:38:38::/etc/ntp:/sbin/nologin

dbus:x:81:81:System message bus:/:/sbin/nologin

avahi:x:70:70:Avahi daemon:/:/sbin/nologin

named:x:25:25:Named:/var/named:/sbin/nologin

rpcuser:x:29:29:RPC Service User:/var/lib/nfs:/sbin/nologin

nfsnobody:x:65534:65534:Anonymous NFS User:/var/lib/nfs:/sbin/nologin

sshd:x:74:74:Privilege-separated SSH:/var/empty/sshd:/sbin/nologin

haldaemon:x:68:68:HAL daemon:/:/sbin/nologin

avahi-autoipd:x:100:104:avahi-autoipd:/var/lib/avahi-autoipd:/sbin/nologin

xfs:x:43:43:X Font Server:/etc/X11/fs:/sbin/nologin

gdm:x:42:42::/var/gdm:/sbin/nologin

baobao:x:500:500:baobao:/home/baobao:/bin/bash

[root@localhost /]# su - baobao

[baobao@localhost ~]$

[baobao@localhost ~]$

[baobao@localhost ~]$ cd

[baobao@localhost ~]$ cd /

[baobao@localhost /]$ rm /prem/newfile

rm: cannot remove `/prem/newfile': Permission denied

[baobao@localhost /]$ su

Password:

[root@localhost /]# ls -ld /prem

drwxr-xr-x 2 root root 4096 Apr 22 01:01 /prem

[root@localhost /]# ls -l /prem/newfile

-rwxrwxrwx 1 root root 0 Apr 22 01:01 /prem/newfile

[root@localhost /]# chmod 777 /prem

[root@localhost /]# chmod 644 /prem/newfile

[root@localhost /]# ls -l /prem/newfile

-rw-r--r-- 1 root root 0 Apr 22 01:01 /prem/newfile

[root@localhost /]# ls -l /prem

total 0

-rw-r--r-- 1 root root 0 Apr 22 01:01 newfile

[root@localhost /]# su - baobao

[baobao@localhost ~]$ rm /prem/newfile

rm: remove write-protected regular empty file `/prem/newfile'? y

[baobao@localhost ~]$ exit

logout

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